When using Mosaico to build an email, I'm never seeing images in the editor - they display when sending tests or real emails, and when previewing the email, but in the editor they appear as a small blue square with a question mark. Has anyone encountered similar, and found a solution?
We're running CiviCRM 5.27.2 in Wordpress.
Update: some more info was requested in the comments. We're running Mosaico 2.4.1592820024 and this is all a recent install. When I check the "network" tab in developers there are indeed two 403 errors which come up when I launch the Mosaico editor, one I think for the image I'm trying to include, and one to wss://public-api.wordpress.com - I can't obviously identify any problems with the Resource URL settings, but guessing that's where the problem/solution lies! Any help is much appreciated :)