What exactly is the problem you're facing? I can't really tell from the screenshots. Integrating 700 subs is probably not the best, system wise, I would divide that into sessions of 200 or less and then combine those integrations with each other.

Well, a random crash that opens a blank modal error box…

not ideal behaviour ☹️ meaning I can’t give a useful error report.

I’ve since reprocessed the batch of files successfully - the machine has an Intel 7700 CPU & 32GB RAM, specifically to be able to process large batches of images: sub-batching is not desirable.

I guess my only problem is the lack of error handling!

Mmm, ok didn't know about the specs, that's indeed weird. Could also have been a systems issue maybe as APP does tax the system pretty hard, difficult to tell. Still, sub-batching isn't that bad, it may be best to integrate all at once but I've not seen big differences between the approaches.