I am trying to upload several jpegs from a computer to My Content and I receive an error that the file type isn't supported. I need a URL to add them to my web map.
the supported types include jpg, but the method of adding content is listed at the bottome of the link
What can you add to ArcGIS Online?—ArcGIS Online Help | ArcGIS
You need to login with an organizational account to add the images to AGOL.
Can you share the link that you are trying to add?