Okay. I did activate that checkbox now. Deactivated ALL plugins except the Patreon one, uploaded a NEW image to my media library and tried to add a Tier lock. Still the same result: No Patreon lock parameters are saved to the image, and the combo box resets to Everyone($ exact). [No Errors in the Browser Console]
I’ve found this error request here: How to use image locking feature in Patreon WordPress plugin - #12 by elioscipioni
I seem to have the same problem. But there is no solution found in that post either.
Anyway, I just read there, that locking will not work for PDF or ZIP anyway, though that was 2 years ago. Does the locking only work for images or has this been extended by now? (Note that I did try with an image, but if it does not work for PDF and Zip I don’t think I’m interested in this feature anyway, even if it did work).