Files upload is now context-aware for libraries. When you select a library folder and then click Upload Files, the new files are uploaded to that library. When uploading to a library or a record, you can add up to 10 local files (1), Salesforce files (2), and files from external sources (3). When you’re in the Owned by Me, Shared with Me, Recent, and Following filters, you can add up to 10 local files, which are added to the Owned by Me filter.
When you upload multiple files, you can view the progress of individual files and cancel uploads in progress.