iPadOS 13: shortcut fails: import took too long

Error from Lr mobile import. Trying to import from SD card - that appears to be unsupported. Copied images to folder on iPad. When attempting to run via shortcuts, the import from files fails with "import took too long." Note that this error is quick. Not long.

When trying to import from Add files, it tends to import 1 or 2 images then stops.