Okular does not open PDF's when stored/filed through Zotero
I am very new to Linux / Ubuntu and have been playing around with it for the past week. I have come across a problem I can't seem to fix. If I want to open a PDF with Okular, which has been stored / filed through Zotero, I get the following message: Could not open file:///home/ingrid/snap/zotero-snap/common/Zotero/storage/GI4FVK9I/Vranken - 2020 - Rooted Hauntology Lab Attempts at vegetal curatio.pdf The only program that can open the files seems to be pdf viewer, but this does not have the functionality I need. Thank you for helping me out!!