I have a custom field to upload a PDF from the front end.
I have pdf as a permitted extension on the image manager (plugin parameters) for my custom profile (image attached).
If I enable Joomla's default file browser, I'm able to attach a PDF but I need to use JCE so that I can block users to navigate away from their folder.
Please let me know what other information you need in order to help me.
I have the latest JCE Editor Pro version installed as well as the latest Joomla 4 version.