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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 18.01=
Operating system and version (eg, Ubuntu 20.04):20.04
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.16.1
PHP version (eg, 7.1):
The issue you are facing:
When you create an external share link it makes a URL with my domain but when you attempt to download or play the media it passes the local IP address. I can change it the incorrectly passed local ip to the domain it works fine
Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
Level
App Message Time
Warning core imagecreatefrombmp: imagecreatetruecolor failed for file "/var/snap/nextcloud/common/nextcloud/data/killerherts/files/size_after.bmp" with dimensions 200x4294967193 2020-06-03T21:02:02-0700
Error PHP imagecreatetruecolor(): Invalid image dimensions at /snap/nextcloud/21026/htdocs/lib/private/legacy/image.php#749 2020-06-03T21:02:02-0700
Error PHP Invalid argument supplied for foreach() at /snap/nextcloud/21026/htdocs/apps/serverinfo/lib/Os.php#155 2020-06-03T20:58:51-0700
Error PHP Undefined variable: result at /snap/nextcloud/21026/htdocs/apps/serverinfo/lib/OperatingSystems/DefaultOs.php#173 2020-06-03T20:58:51-0700
Error PHP Invalid argument supplied for foreach() at /snap/nextcloud/21026/htdocs/apps/serverinfo/templates/settings-admin.php#101 2020-06-03T20:58:50-0700
Error PHP Undefined variable: result at /snap/nextcloud/21026/htdocs/apps/serverinfo/lib/OperatingSystems/DefaultOs.php#173 2020-06-03T20:58:49-0700
Warning core imagecreatefrombmp: imagecreatetruecolor failed for file "/var/snap/nextcloud/common/nextcloud/data/killerherts/files/size_after.bmp" with dimensions 200x4294967193 2020-06-03T20:58:37-0700
Error PHP imagecreatetruecolor(): Invalid image dimensions at /snap/nextcloud/21026/htdocs/lib/private/legacy/image.php#749 2020-06-03T20:58:37-0700
Warning core imagecreatefrombmp: imagecreatetruecolor failed for file "/var/snap/nextcloud/common/nextcloud/data/killerherts/files/size_after.bmp" with dimensions 200x4294967193 2020-06-03T20:58:16-0700
Error PHP imagecreatetruecolor(): Invalid image dimensions at /snap/nextcloud/21026/htdocs/lib/private/legacy/image.php#749 2020-06-03T20:58:16-0700
Warning core imagecreatefrombmp: imagecreatetruecolor failed for file "/var/snap/nextcloud/common/nextcloud/data/killerherts/files/size_after.bmp" with dimensions 200x4294967193 2020-06-03T20:52:33-0700
Error PHP imagecreatetruecolor(): Invalid image dimensions at /snap/nextcloud/21026/htdocs/lib/private/legacy/image.php#749 2020-06-03T20:52:33-0700
Error lib ResourceLocator can not find a web root (root: /var/snap/nextcloud/21026/nextcloud/extra-apps/calendar, file: index.php/css/calendar/a2fe-b026-calendar.css?v=d41d8cd98f00b204e9800998ecf8427e, webRoot: , throw: true) 2020-06-03T19:52:01-0700
Error PHP opendir(/home/killerherts/Plex/): failed to open dir: Permission denied at /snap/nextcloud/21026/htdocs/lib/private/Files/Storage/Local.php#127 2020-06-02T10:04:39-0700
Error PHP opendir(/home/killerherts/Plex/): failed to open dir: Permission denied at /snap/nextcloud/21026/htdocs/lib/private/Files/Storage/Local.php#127 2020-06-02T09:59:27-0700
Error PHP opendir(/home/killerherts/Plex/): failed to open dir: Permission denied at /snap/nextcloud/21026/htdocs/lib/private/Files/Storage/Local.php#127 2020-06-02T09:45:19-0700
Error ocs_api Swift_TransportException: Connection could not be established with host 127.0.0.1 :stream_socket_client(): unable to connect to 127.0.0.1:25 (Connection refused) 2020-06-02T09:37:51-0700
Error ocs_api Swift_TransportException: Connection could not be established with host 127.0.0.1 :stream_socket_client(): unable to connect to 127.0.0.1:25 (Connection refused) 2020-06-02T09:31:39-0700
Warning ocs_api OC\HintException: Password is among the 1,000,000 most common ones. Please make it unique. 2020-06-02T09:31:21-0700
Warning no app in context Login failed: *@gmail.com (Remote IP: 192.168.1.168) 2020-06-02T09:18:44-0700
Warning no app in context Login failed: *@gmail.com (Remote IP: 192.168.1.168) 2020-06-02T09:12:32-0700
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'apps_paths' =>
array (
0 =>
array (
'path' => '/snap/nextcloud/current/htdocs/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/snap/nextcloud/current/nextcloud/extra-apps',
'url' => '/extra-apps',
'writable' => true,
),
),
'supportedDatabases' =>
array (
0 => 'mysql',
),
'memcache.locking' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/tmp/sockets/redis.sock',
'port' => 0,
),
'instanceid' => 'ocugdv02cryh',
'passwordsalt' => '*',
'secret' => '*',
'trusted_domains' =>
array (
0 => 'cloud.xxx.club',
1 => '192.168.1.168:81',
),
'datadirectory' => '/var/snap/nextcloud/common/nextcloud/data',
'dbtype' => 'mysql',
'version' => '18.0.4.2',
'overwrite.cli.url' => 'https://cloud.lightmedia.club',
'dbname' => 'nextcloud',
'dbhost' => 'localhost:/tmp/sockets/mysql.sock',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => '*-*',
'installed' => true,
'maintenance' => false,
);
The output of your Apache/nginx/system log in /var/log/____:
2020/06/03 19:45:50 [error] 939#939: *9219 client intended to send too large body: 3472108 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/01-A%20Greater%20God.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:03 [error] 939#939: *9377 client intended to send too large body: 4862617 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/06-I'm%20Going%20Straight%20To%20Heaven.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:12 [error] 939#939: *9396 client intended to send too large body: 6828340 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/05-Shut%20Up.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:18 [error] 939#939: *9393 client intended to send too large body: 7786744 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/08-Talking%20To%20The%20Spirits.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:26 [error] 939#939: *9385 client intended to send too large body: 6810735 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/03-Truth%20Is%20Out%20Of%20Style.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:27 [error] 939#939: *9410 client intended to send too large body: 5221933 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/02-Real%20Black%20Angel.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:31 [error] 939#939: *9411 client intended to send too large body: 8276678 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/07-Spaceman.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:32 [error] 939#939: *9405 client intended to send too large body: 6663595 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/09-Too%20Bad.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:33 [error] 939#939: *9413 client intended to send too large body: 6405205 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/04-UFOs%20Are%20Real.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:41 [error] 939#939: *9420 client intended to send too large body: 6855839 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/11-Born%20With%20Monkey%20Asses.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:43 [error] 939#939: *9416 client intended to send too large body: 4879531 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/12-Straight%20To%20Heaven%20(Instrumental).mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:52 [error] 939#939: *9426 client intended to send too large body: 7355891 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/13-UFOs%20Are%20Real%20(Exhibit%20B).mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:46:58 [error] 939#939: *9429 client intended to send too large body: 7177518 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/14-Truth%20Is%20Out%20Of%20Style%20(12''%20Mix).mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:47:05 [error] 939#939: *9431 client intended to send too large body: 10485760 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/dav/uploads/Jamie/web-file-upload-8f7b5ee75c1193965a17f56912f76e1a-1591238748670/0 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:47:08 [error] 939#939: *9436 client intended to send too large body: 10485760 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/dav/uploads/Jamie/web-file-upload-234bd84da78a4602386a413eedbdd980-1591238748670/0 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:48:57 [error] 939#939: *9507 client intended to send too large body: 2829211 bytes, client: 162.158.255.227, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/kids%20room-100524-100530.mp4 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 19:56:20 [error] 939#939: *9913 client intended to send too large body: 3472108 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/webdav/Jamie_Music/1/01-A%20Greater%20God.mp3 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 20:11:08 [error] 939#939: *10426 client intended to send too large body: 10485760 bytes, client: 172.69.68.60, server: cloud.lightmedia.club, request: "PUT /remote.php/dav/uploads/Jamie/web-file-upload-04e7b2aaf922289b9b2fe0c738293be3-1591240265367/0 HTTP/1.1", host: "cloud.lightmedia.club"
2020/06/03 20:20:25 [error] 939#939: *10632 upstream prematurely closed connection while reading upstream, client: 172.68.141.187, server: cloud.lightmedia.club, request: "GET /index.php/s/r4QD9MqTLXPgRmW/download HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/s/r4QD9MqTLXPgRmW/download", host: "cloud.lightmedia.club"
2020/06/03 20:30:20 [error] 939#939: *10841 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1", upstream: "http://192.168.1.168:81/ocs/v2.php/apps/notifications/api/v2/notifications", host: "cloud.lightmedia.club"
2020/06/03 20:30:26 [error] 939#939: *10852 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "POST /index.php/apps/text/session/sync HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/apps/text/session/sync", host: "cloud.lightmedia.club"
2020/06/03 20:36:41 [error] 939#939: *10948 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "POST /index.php/apps/text/session/sync HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/apps/text/session/sync", host: "cloud.lightmedia.club"
2020/06/03 20:40:58 [error] 939#939: *11259 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.141.7, server: cloud.lightmedia.club, request: "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1", upstream: "http://192.168.1.168:81/ocs/v2.php/apps/notifications/api/v2/notifications", host: "cloud.lightmedia.club"
2020/06/03 20:45:07 [error] 939#939: *11013 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "POST /index.php/apps/text/session/sync HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/apps/text/session/sync", host: "cloud.lightmedia.club"
2020/06/03 20:45:11 [error] 939#939: *11346 connect() failed (111: Connection refused) while connecting to upstream, client: 162.158.126.119, server: cloud.lightmedia.club, request: "GET / HTTP/1.1", upstream: "http://192.168.1.168:81/", host: "cloud.lightmedia.club"
2020/06/03 20:45:12 [error] 939#939: *11348 connect() failed (111: Connection refused) while connecting to upstream, client: 162.158.126.127, server: cloud.lightmedia.club, request: "GET /favicon.ico HTTP/1.1", upstream: "http://192.168.1.168:81/favicon.ico", host: "cloud.lightmedia.club"
2020/06/03 20:45:13 [error] 939#939: *11350 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "POST /index.php/apps/text/session/sync HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/apps/text/session/sync", host: "cloud.lightmedia.club"
2020/06/03 20:47:10 [error] 939#939: *11380 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "POST /index.php/apps/text/session/sync HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/apps/text/session/sync", host: "cloud.lightmedia.club"
2020/06/03 20:47:16 [error] 939#939: *11380 connect() failed (111: Connection refused) while connecting to upstream, client: 172.68.142.236, server: cloud.lightmedia.club, request: "POST /index.php/apps/text/session/sync HTTP/1.1", upstream: "http://192.168.1.168:81/index.php/apps/text/session/sync", host: "cloud.lightmedia.club"
The solution is adding ‘overwritehost’ => ‘example.com’, to your nextcloud config.php this will fix webdav and share links showing your local host address
