iOS 12 app crashing on PDFs upload when using "Copy to Nextcloud" export function from other apps


I’ve got Nextcloud app crashing on my iPad when trying to upload PDF documents from different applications using export function and “Copy to Nextcloud” button.
I’m able to sent name of file, choose destination, but after tapping “Upload file” button, Nextcloud app crashing.
I’m sharing crash log here.
I’ve tried to export PDFs from Adobe Fill&Sign, Gmail, so the source app is not an issue. Also I’ve tried rebooting iPad, and re-installing Nextcloud app, issue remains
Nextcloud server v 19.0.1 runing in Docker

Best regards