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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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, 20.0.5): 25.0.10
Operating system and version (eg, Ubuntu 20.04): raspbian
Apache or nginx version (eg, Apache 2.4.25): Apache2 2.4.56
PHP version (eg, 7.4): 7.4.33
The issue you are facing:
When I try to watch a video larger than 64 MB with Memories (V 5.4.1) and Firefox (any), I get “The media could not be loaded, either because the server or network failed or because the format is not supported.”. This happens only with the combination Memories / Firefox. Other browsers (tried Chrome and Falkon) play those videos fine, also if I open the video in Nextcloud via files or photos. No errors reported in any log. Video < 64 MB will play just fine. Tried on different client-computers.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- Open a video larger than 64 MB with Memories and Firefox
- Open the same video with Memories and another browser
- Open the same Video in Nextcloud with files or photos
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'instanceid' => 'XXXX',
'passwordsalt' => 'xxxxxxxxx',
'secret' => 'xxxxxxxxxxxxxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'nextcloud.my.lan',
1 => 'nextcloud.another.lan',
),
'datadirectory' => '/mnt/elements/data',
'dbtype' => 'mysql',
'version' => '25.0.10.1',
'overwrite.cli.url' => 'https://nextcloud.home.lan',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'xxxxxx',
'installed' => true,
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'memcache.local' => '\\OC\\Memcache\\APCu',
'default_phone_region' => 'DE',
'mail_from_address' => 'me',
'mail_smtpmode' => 'sendmail',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'nextcloud.home.lan',
'mail_smtpsecure' => 'ssl',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'mailserver',
'mail_smtpport' => '465',
'mail_smtpname' => 'me@mailserver',
'mail_smtppassword' => 'xxxxxx',
'app_install_overwrite' =>
array (
0 => 'social',
1 => 'files_external_gdrive',
),
'filesystem_check_changes' => 1,
'memories.exiftool' => '/var/www/html/nextcloud/apps/memories/exiftool-bin/exiftool-aarch64-glibc',
'memories.vod.path' => '/var/www/html/nextcloud/apps/memories/exiftool-bin/go-vod-aarch64',
'memories.vod.ffmpeg' => '/usr/bin/ffmpeg',
'memories.vod.ffprobe' => '/usr/bin/ffprobe',
'enabledPreviewProviders' =>
array (
0 => 'OC\\Preview\\Movie',
1 => 'OC\\Preview\\Image',
),
'memories.gis_type' => 1,
);