there's no error message, it just completes without downloading all of the items. I'm using Chrome on a Macbook, tried Safari as well and have tried on other computers in the store. 

Thank you for letting us know, @page158, can you please give us examples of items not showing on the export?

They export alphabetically, the last export i did stopped at an item called 

Choosing the Right Shelter Dog (token WTXILMEWRD23CSA4XH5Y7WES)

So anything alphabetically after that isn't there, search for Dog Man for example, there are 15+ items with that in the name such as Dog Man: Brawl of the Wild. My total item library was over 54,000 items last time I made a note of the number so it won't be hard to find examples.

The process for Importing/Exporting changed recently, the popup screens look different, the options for format are now only on the Export screen. There are also instructions in the download template file and the Weight column was added. This started occurring around that same time. 

Can you export the full CSV file with 54000+ items?

I appreciate all of the additional details on this, I am going to check with our team about this and why this is happening. @page158 I appreciate your patience!

I also notice that in the Undo Catalog option, the latest date is May 30th, so that's likely the last time I was able to download the full file and upload new items via Import. Since then it's been failing.

I just ran another export and and go the full 54505 rows, not sure what changed but it's working now!

It looks like it was an internal disruption that was causing this, but has been resolved. I'm happy to hear it is working as intended for you again, @page158! If anything comes up again, please let us know.