When selecting .md file, widget crashes

[fould12]

Using the file browser, I try selecting an *.md file on an external SD Card, and when clicking it in the file browser, no new widget is made, instead it seems like the widget crashes, and no new widget is made.
Sometimes I am able to make a widget based on an *.md file, but it does not display a preview in the widget, and when clicking on the widget, it just opens up the widget app (where it displays the homescreen with a button to buy a coffee, and the test text).
I'm not sure if you need more information, let me know if you would like more info.

Downloaded the *.apk file from the link:
https://f-droid.org/packages/ch.tiim.markdown_widget/
Downloaded version: 0.1.4

Phone information:
Model: Galaxy A12
Model #: SM-A125W
Android version 11
One UI Core version (not sure if this is important): 3.1
Kernel version: 4.19.127-22457745