So, I've followed the instructions at
https://www.resourcespace.com/knowledge-base/plugins/adobe_link for enabling the Adobe Link plugin, and everything works (btw, I had to use that Anastasiy's Extension Manager thing mentioned as an "if you are unable to run" option)...the ZXPInstaller said it wasn't compatible with the versions of Adobe software I have (I keep my Adobe stuff
very up-to-date))
Anyway, everything works up to the point where I have to log into ResourceSpace from within Adobe InDesign (this works as expected in Adobe Photoshop, btw...no cookie error appears on the login screen or anything)...the little browser window that appears within the ResourceSpace window within InDesign has red text below the login prompts that says "A cookie could not be set correctly. Please make sure you have cookies enabled in your browser settings." and the "Local time zone" dropdown just shows the first item in the list. If I enter my username and password and select the time zone that should be in the list, then there's a pause and the same login screen comes up with same red error text about cookies.
The weird part is that, when I check our ResourceSpace website in Firefox, Chrome, and Edge (the only three web browsers on my computer), none of them have the error message about cookies...all three work as expected.
So, how do I fix the cookie error in InDesign, and why is this thing working fine in Photoshop?