When you add a song to rekordbox and later you edit the song, lets say in a way you cut some part of it the file size chance. You need to re-analyze song to map the new waveform but the file size is left unchanged, Reload tags don't help.
Can re-analyze or reload tags in future release also look on the file size?
For now only remove and add can help, but that's not nice solution :)
I saw that similiar problem is here, but no response there.
https://forums.pioneerdj.com/hc/en-us/community/posts/203071189-Track-file-sizes-don-t-update-when-the-source-file-is-changed?input_string=File%20size%20is%20not%20updated
but a bigger problem is then the exporting to usb. Rekordbox think that the file is already on flash drive and don't replace the old file in usb with new file. Hot cues, memory points and waveform is replaced. The waveform then really don't say nothing about the track because its incorrect . some MD5 check will be really useful.