> We delete background images when we can't create thumbnails for it and an exception is raised.
> Your image contains an alpha channel, so the thumbnail conversion fails:
> ```
> OSError: cannot write mode RGBA as JPEG 
> ```
> The ATS cache probably leads to the file appearing as existing for some time,whereas it is actually deleted immediately.
> 
> So a few things we should fix there:
> 1) Convert RGBA to RGB
> 2) Don't remove the background if thumbnail creation fails
> 3) Save thumbs with the proper file extension
> 4) (Make quality configurable)
I see, thanks for both of you helping me out. I guess don't have alpha channels in images until this is fixed