Pinry - help!

Can anyone help me with Pinry?

I've run Pinry in a Docker container on a Synology NAS for a couple of years and it's always worked great with no problem... up until I upgrades DSM to 7.2.

Pinry still works fine if I upload saved images. If I try to use the Firefox extension or paste in the url it does nothing. It must be a permissions issue that changed when I upgraded the DSM. I've tinkered with all sorts of setting to no avail and the logs say nothing. I've done the obvious searches online to see if I can find a solution.

Does anyone who hosts Pinry know what the problem is? (It's bound to be REALLY obvious). Thanks in advance.