We had this problem begin a couple of months ago and I’m at loss for figuring out why it’s happening and what we need to do to fix it. 

We use the External Supplier Invoice Assistant tool to upload some of our invoices:

Everything appears to load without errors:

We can see that they’re loaded on External Supplier Invoice:

I can check the invoice without problems:

And create the invoice without errors:

I can see that it’s finding out image file but the image file status is showing “DocumentNotCheckedIn”:

And that’s where we’re having problems. This is the same process we’ve used for years and the image file status was always DocumentCheckedIn. We don’t know if this was broken by an update, or if some setting changed that had consequences we didn’t anticipate, but we can’t figure out why our documents aren’t being checked in anymore and that’s what we’re trying to fix. 

I found a related posts here but our setup appears to be good so it hasn’t helped us resolve the issue, and I’m wondering if there’s something else I should look at.