Hi Barb,
I tried this in 9.3C - on premise - and ran into the same issue, but only for Payables. It works fine in Receivables and Ledger. I opened a bug for this issue.
While creating an invoice, I click the attachment icon,
and the file explorer comes up, but I can only select one document. If I ctrl click or ctrl shift click, it still only selects the last item I click on.
Once I click at least one item, I can then click on the same file attachment icon, and click New, then I am able to select multiple items in the file explorer
So multiple items can be attached, but it takes at least two attempts.
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Regards,
Softrak Tech Support