I can't upload a CSV to import records!

I’ve been trying to import a dataset. (114 records, 100 fields, all text fields, no relationships) to my Adalo app. I’ve been trying for about a week, but I can’t get the upload to work (screen video attached). Any ideas on this?

In case it’s helpful context, my records are currently stored in Airtable…I tried setting it up as external collections, but the app was really slow to I decided to just import the records to Adalo. That was about 6 weeks ago, and I know that there have been some updates since then. So if I’d be better off trying to set up external collections I’m open to the idea!