Image Post Won't Disappear (Google Drive)

An image post was automatically generated when I dragged an image into my Google Drive. It never goes away even though the image file has been removed from Google Drive. I'm wondering how to fix this and prevent this from happening. Could we have a button to purge the cache or notify the CDN to delete our stuff immediately? It's kind of annoying and sometimes troublesome to fail to delete inappropriate content immediately.

I've sent emails to customer service but think others might have come across the same issue, so I'm also posting it here. I sincerely hope that the site can truly reflect the file structures on our cloud storage in real time. If a file is already removed from our end, it should not stay on the site for hours or days. Better yet, we could be allowed to delete files directly from dashboard since Blot keeps a copy of data on its server. It's not really a good experience to be unable to delete unwanted data at the user's discretion.

Also, I think it would be better if Blot could automatically post an image or file only when its name starts with an underscore. Most of the time users don’t just hope to post an image with a default caption “image” and a default title “image.” Automatic posting doesn’t make much pragmatic sense. It may even create problems when a file is unintentionally uploaded to the cloud drive, considering that it may stay live for an indefinite amount of time.

What's more, I can't switch to DropBox. Upon authorization it says ":( Error"