Trying to install an update via file path, getting "OS already up to date" message

[nad0vs]

Basically what it says on the tin can. I am reasonably (98.9999%) sure I am not mixing things up and using a new file with a recent OTA freshly cooked via AVBRoot.

Why is this happening and how do I solve it ?

EDIT TO ADD: in debug mode, checking the "allow reinstall" option (without the automatic option of course, lol) allowed me to successfully install the OTA update, it worked splendidly and yes, the update was correct (so there was no error on my part and there is something wrong with how Custota verifies whether update is in fact a "new thingie" in file path mode)