I have setup a server for my mother and all of a sudden when she tries to play some movies and TV shows she gets the error: “App cannot direct play this item. Direct play is disabled.”. She is getting it with movies she has watched in the past without and issue and ones she has never watched before. In Plex, I go into Settings > Plex Web > Debug and Direct Play is checked. Some of the movies she has are also ones that I have and ripped from the same source.
Any help is appreciated.
Server Version#: Synology DiskStation DS218j
Player Version#: 1.19.1.2645
MODERATOR EDIT: Raw Plex/web text logs redacted
Please download the Server logs ZIP file (Settings - Server - Troubleshooting - Download Logs) and attach that ZIP file.

