original filename is replaced by timestamp when document is handed over from another app

Expected behaviour

I am using the "Genius Scan" app to create PDF. Before exporting the document to Nextcloud I rename the file within Genius Scan. Expected behaviour is that the new file name is used while uploading the document to the Nextcloud server.

Actual behaviour

Instead of using the file name I selected/changed within Genius Scan a new file name is created based on current system date & time (e.g. 2019-06-05 00-06-52-1.pdf

The issue seems to be within the Nextcloud app. If I export the same document via Genius Scan to Google Drive everything works perfectly. This worked in the past and seems to have stopped working with one of the latest updates of the Nextcloud app.
I already reported this feature request in 2017 and it got implemented as feature request. Please refer to issue #275

Steps to reproduce

1. create a PDF document with Genius Scan app
2. rename the file within Genius Scan app
3. export the renamed file to nextcloud and upload

iOS version

12.2

App version

Nextcloud: 2.23.6.15
Genius Scan: 5.2.1

Server configuration

Nextcloud version: (see Nextcloud admin page)
15.0.7

Start by reproducing the Genius Scan-to-Nextcloud handoff described in the steps, using a renamed PDF, and compare the uploaded filename with the source filename. Done means the iOS app preserves the renamed source filename instead of replacing it with a timestamp; verify the behavior against the listed app and iOS versions if available.