Photos app freezes upon import / photo importing problems

It looks like I'm just going to have to wait until Microsoft fix the bug they introduced in the September update.

Like 10000000000+ issues described here and at another official MS portals. Unfortunately.

I had replied earlier that I have had this problem off and on since I went to an iPhone 8 (from a 5s) two years ago.  It primarily happens when I have a large number (thousands) of photos with videos to upload.  This most recent time it took me working in small amounts, 50-100 pics.  I was able to successfully transfer all of them (eventually).  After trying a couple of small groups and getting the freeze, I would reboot both the Windows PC and the iPhone to transfer more.  I did move the videos by copying from files, iphone.   

I just had to import more photos and videos.  The whole process seemed to work smoother and worked on the first try.  I had 133 pics and 5 videos including live photos.  It worked on the first try.  I do not know if the latest Cumulative update helped or not.  I am still on ios 12.4.1 (waiting for 13 to settle down) and Windows 10 build 1903.  The PC did update with the 2019-12 Cumulative update so maybe, it is working smoother.  

The photos app not keeping track of what photos are new, is an old problem that of course, still persists.  I am just excited if the freeze problem is fixed.

To try to fix Photos app Reset and Repair Photos app at Settings > Apps > Apps & Features > Photos app > Advanced Options. Your pictures will be safe in the User Pictures folder.

Wanted to contribute as gratitude, by providing some feedback for others that this (quoted above) fixed my issue with Importing media from my iPhone running IOS 13.3. Prior to applying this fix, Microsoft Photos would stall during the scanning phase, specifically after showing about 399 detected photos, then the animation would stop and the app would not respond to any UI interactions.

If resetting doesn't work, I would recommend folks here to try to change this one setting that fixed a different problem I had importing individual media (that is large in size) -- Go to the iPhone settings for your Photos app, and then scroll to the bottom section labeled "Transfer To Mac or PC". Switch this to "Keep Originals", and this should skip the process of checking the files for compatibility, which has fixed my issues with importing some large GB's sized video files.

Good luck!

well then, I'm sorry it wasn't of any help. It worked for the iphone 6s I have. Maybe it doesn't work with just cameras or other iphones? Btw,  have you tried disabling Autoplay? (https://www.techrepublic.com/article/how-to-disable-autoplay-and-autorun-in-windows-10/). Hope this helps

I was unable to import using the photos app as it kept freezing like it does for everyone but this worked for me. Thank you for your help.

As well as plugging in iphone and right click import pictures in my computer, try this as I was still have some issues. On the iphone in settings (use search at top), find transfer to pc or mac option. In there at the bottom, there is the transfer to pc or mac, automatic or keep originals. I found mine was set to default, however changing this to keep originals sorted out the transfer issues. Not sure if this is the issue with the photo app within windows 10, if someone can test.