I have a number of photos that were scanned as very large files from slide film. These files can be over 100MB on disk. I don’t know where the breaking point is, but none of the Plex clients I have can display them (hence, this report is in General Discussions). They report “Unable to load photo” (Plex Web), or “There was a problem playing this item” (PMP). They are in tiff format, but I have several smaller tiff files that Plex has no trouble with.
So it turns out this is a designed limit, so this report should be a feature request rather than a bug. If a Ninja would like to move this to the Feature Request forum, I will re-write it to be more of a request.
There was an issue in PMS regarding this. Should be fixed in the 1.5 branch. The bug was in analyzing the file so try dancing the file for the fix to work.
FYI, to convert megabytes to mebibytes, multiply megabytes by 0.953674.
This seemed to work just fine. My largest image is about 216 MB, so I set TranscoderPhotoFileSizeLimitMiB=220 in preferences.xml and restarted PMS. Now Plex Web and Plex Roku display all my photos.