I noticed that AGOL does not pick up links with spaces in them and make them a 'more info' link in a webmap popup. For example https://www.sagis.org/content/gisdata/hyperlinks/SAV/LOMC/Elevation_Certs/magazine ave 530.pdf in a layer we have of elevation certificates. For now, I will probably just use python to remove all the spaces in the file names and attribute table. But it would be nice if ArcGIS Online worked with filenames with spaces in them. Also it would be nice to be able to change where it says 'more info' to something else, similar to how we can change field names to something nicer.