Attachments stall, never completely finish
Many users have noticed that when PDF attachments are uploaded, they take a very long time in the processing/uploading phase, and sometimes the progress bar stalls at 50% and never finishes.
This has been an issue for my organization as well
I've gotten this a lot
Pam Hill commented
I switched from Zotero, and now I feel like I may go back. With Zotero, it automatically uploaded PDFs in seconds. PDFs just don't work with the new RefWorks. I have to store my PDF in a file on my computer. I prefer having it all in one place like with Zotero.