This is perhaps a surprising question, as i’ve been using SFOS on an XA2 Plus since January 2019, and also have two other SFOS devices. But I don’t watch video files on my phone.
The “media” app seems to only work with Music files, and has no navigation tool to point it at the \video folder.
The third party “File browser” app is the only native thing I have found that works. It plays videos, but has no media navigation controls, so if the phone locks you have to start from the beginning again.
The question is interesting because I use my old Xperia X as an occasional child travel device, and using the “File Browser” app to play videos is frankly a subpar experience.
What do you guys do?