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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): 19.0.3 (Docker nextcloud:19-apache)
Operating system and version (eg, Ubuntu 20.04): Ubuntu Server 18.04.5
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.38 with Apache/2.4.29 reverse proxy
PHP version (eg, 7.1): 7.4.10
The issue you are facing:
Photos uploaded automatically via the iOS Nextcloud app sometimes end up zero byte files on the server. No attempt is made to resume or re-transfer the files. Viewing the details of one of the files in the app results in an app crash.
The same photos can be uploaded manually with no issue. I checked the server’s data folder and the affected files are indeed zero bytes.
The issue is intermittent and has been happening for a little while. The oldest zero byte file is 2 months old which probably puts it around the time I upgraded to NC19.
Is this the first time you’ve seen this error? (Y/N): No
Steps to replicate it:
- Take photo
- Allow app to auto upload
The output of your Nextcloud log in Admin > Logging:
Nothing relevant, nextcloud log has rolled out since the last zero byte upload a few days ago.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
"system": {
"htaccess.RewriteBase": "\/",
"memcache.local": "\\OC\\Memcache\\APCu",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"port": 6379
},
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": {
"0": "127.0.0.1:8080",
"2": "***REMOVED SENSITIVE VALUE***"
},
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "19.0.3.1",
"overwrite.cli.url": "http:\/\/127.0.0.1:8080",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"overwritehost": "***REMOVED SENSITIVE VALUE***",
"overwriteprotocol": "https",
"mail_smtpmode": "smtp",
"mail_smtpsecure": "tls",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpauthtype": "LOGIN",
"mail_smtpauth": 1,
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "587",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"loglevel": 0,
"updater.release.channel": "stable",
"theme": "",
"app_install_overwrite": [
"keeweb"
]
},
The output of your Apache/nginx/system log in /var/log/____:
I found these entries in the container log where the last zero byte file was uploaded and then where my laptop Nextcloud client downloaded it.
172.18.0.1 - karl [27/Sep/2020:01:02:23 +0000] "PUT /remote.php/webdav/Pictures/iPhone%20Sync/2020-09-26_1224_7305.jpg HTTP/1.1" 201 950 "-" "Mozilla/5.0 (iOS) Nextcloud-iOS/3.0.6"
172.18.0.1 - karl [27/Sep/2020:01:02:26 +0000] "PUT /remote.php/webdav/Pictures/iPhone%20Sync/2020-09-26_1224_7305.jpg HTTP/1.1" 204 893 "-" "Mozilla/5.0 (iOS) Nextcloud-iOS/3.0.6"
172.18.0.1 - karl [27/Sep/2020:01:02:50 +0000] "GET /remote.php/dav/files/karl/Pictures/iPhone%20Sync/2020-09-26_1224_7305.jpg HTTP/1.1" 200 831 "-" "Mozilla/5.0 (Windows) mirall/3.0.1stable-Win64 (build 20200828) (Nextcloud)"