If you upload an image by hitting “preview” and then don’t finish by hitting “save” or “abort”, that image just kinda floats out there taking up server space. So, that counts toward your one per day. Abandoned pending images get purged every night at 2 a.m.
system time.  If you upload an image successfully then delete it, that does not count on your upload for the day so you can re upload again. So please be sure in the future that you don't hit the back button but follow the instructions of hitting save or abort when previewing so this won't happen for you.

 

 

Thanks