I have case sensitive problems in TYPO3 v 8.7 LTS. System is sometimes mocking that a file is missing. The error message is
Oops, an error occurred!
File /archiv/ABCD.pdf does not exist.
Allthough the file is there. When I put the file in lowercase to fileadmin "abcd.pdf" than FAL isn't mocking around. But seems after a while it still is mocking. At least I am not understanding where the problem lies. Because even if ABCD.pdf is there and in the right place I get warnings.
I checked DB integrity several times. But still no luck. Afterwards delete the cache in INSTALL TOOL.
I found DB tables where files are stored. Is there a way, that I manually can update this tables and get rid of these error message?