The popup to login in pops up and disappears after clicking "Allow," but after that, nothing happens.
I believe they recently dropped support for the old V1 API. Have you switched to using OAuth 2 API? Also you might want to check the Redirect URls as it needs to be https as http is only allowed for localhost now.
You might want to check their migration guide: https://www.dropbox.com/developers/reference/migration-guide
Thank you so much. I think you're absolutely right but I'm not sure how to apply their new API to Moodle? The Redirect URI is in fact https://
On the moodle side of things, I only needed to enter an API Key + Secret, no word on how to fix up the oauth :/
Looks like I've run into the same problem as you did. Could you explain what you did to "rebuild" your DB app?
This is something I don't normally use anymore since I retired from teaching. I just set it up during Quality Assurance testing for Moodle 3.3, to run a test. If I remember correctly, the directions for setup and use in Moodle 3.3 are different than those used in previous versions of Moodle. I just followed the directions in the QA Test at - https://tracker.moodle.org/browse/MDLQA-10679
Ah-ha... Excellent. Thanks for the tip.