I posted this 5 days ago in the Feedback and Suggestions section but no response yet so I'm trying here. I've tried to upload again this morning (21.03.2022) with the same error. I've copied my original post below...
In the last day and a half 'Import Records from a Spreadsheet' hangs up at the message "Preparing to Upload" which is on the screen after the page that checks that all the fields are aligned. Just tried again this morning (16.03.2022) unsuccessfully. I've used the Import Records from Spreadsheet many times and uploaded 4 spreadsheets successfully only 2 days ago (14.03.2022) in the morning. I do relatively small batches of a few hundred at the most. I've got about a thousand to upload when the Import Records system is back.
Thanks
At the moment I think the forum is only monitored intermittently, so for stuff like this I'd probably email direct to make sure you get a response.