UIDs are the unique IDs, but depending on the board, IDs may not be enabled. from what i've gathered, it only displays more than 1 when ID's are enabled the screenshot is from a thread in General which has IDs enabled the amount of files are the amount of media posted, so like pictures, videos, etc which thread is this on?

>>58 hmm in that case I think UIDs should display as 0 or -1 if ids are disabled