Disclaimer: I've been Googling and experimenting on this for hours and have found people looking for answers - but no answers...
SharePoint Online has very intuitive support for drag-and-drop from one's PC to SharePoint (upload). What I need to do is offer (technophobic) users a simple way to drag-and-drop files from SharePoint to one's PC (download). When I attempt to do so, it creates shortcuts on the PC to the SharePoint file. I've been experimenting with both IE and Chrome and can not get either to work.
This thread:
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_sharepoint/drag-and-download-does-not-work-from-sharepoint-to/8dd2bd9e-8fcf-4fac-ac5b-40cd4eb4510e
discusses the issue but didn't help. Their suggestion of using SharePoint's "Open with Explorer" button is a bit too flaky. I'll have the folder open then truly unexpectedly, I'll get this:
I tried adding all of these:
https://.sharepoint.com
\\COMPANY_DOMAIN.sharepoint.com@SSL\
\\.sharepoint.com
\\*.sharepoint.com@SSL\
to the trusted sites list.
I'm not sure exactly what "select the option to login automatically" means. I guessed it means the "remember me" checkbox on the SharePoint login page. But that didn't help. Still get the same flakiness.
This is the closest thing I found on SP StackExchange:
SharePoint Online Drag and Drop trying to copy from Sharepoint Library to computer or hardrive
In case someone has a completely different solution / approach, the goal is to allow simple and secure transfer of files from someone external to our company to people internal to the company. I really would like to use SharePoint and not something else like DropBox because I could really administer permissions far easier with SharePoint.
Any suggestions would be super-appreciated.