Plugin appears to be stalling

Good afternoon,
I only have 14 posts, and <50 photos total on my site, but when I attempted to import all the photos only one post (with 4 photos) imported. The status bar stalled, for 3 minutes or so nothing else imported, so I refreshed the page. Now, when I attempt to Import Images, the status bar stalls. When I go to an individual post to update photos, I click update and I get a blank browser page – the photos have not been imported.
Any thoughts?
Best,
Anna

https://ww.wp.xz.cn/plugins/import-external-images/