For many many years now, in Mac OS, there has been an issue in Premiere (and apparently some other Creative Cloud suite of applications) where, in any of the File Export or Save As dialog boxes, when one brings up the "Create New Folder" dialog box, one cannot paste text into text field. This is something encountered many many times daily for some of us. In the Illustrator forums, this same issue has been upvoted many many places. An Adobe employee acknowledged that this was a known issue YEARS AGO, and suggested upvoting the initial complaint.
Some relevant posts:
https://community.adobe.com/t5/illustrator-discussions/unable-to-copy-amp-paste-in-save-as-dialog-bo...
https://illustrator.uservoice.com/forums/601447-illustrator-bugs/suggestions/39374122-still-not-able...