I have been trying to load a very large tile package to our ArcGIS Online Account. Per this page, we meet the requirements for loading it. However, I have tried twice now and received this error message:
I'm not sure what makes the tile package a multipart item. I tiled imagery at multiple scales in JPG format, so perhaps the "multipart" refers to the different scale levels?
I have successfully loaded large TPKs to our ArcGIS Online account before. This is the first one I have created in Pro, however (ver 2.3.1).