Latest Android app breaks viewing log files

I've created 21 test files with different file extensions with appropriate content, a mix of text and binary files. 4 of these extensions are "homemade" (marked in bold below) but I would still expect the Dropbox app to allow me to choose the viewer for each and keep that mapping as the preferred viewer:

.bak
.cache
.conf
.css
.db
.deb
.downloaded
.html
.ico
.ini
.jar
.json
.log
.m3u
.png
.properties
.sh
.txt
.xlsx
.xml
.zip

I've dusted off an old phone with a previous version of the Dropbox app and that works with more file extensions (but still not all).

Here's the comparison:

• Dropbox 310.2.2 Android 9: 13 out of 21 work
• Dropbox 320.2.10 Android 12: 9 out of 21 work (4 less than before: .ini, .json, .log, .properties.xml no longer work but .zip has started working)
  

If you contact me via e-mail I can share a link to my Dropbox folder structure with the test files.

Dropbox 310.2.2 Android 9: 13 out of 21 work

1. Text

1.1 Failure (should give me the opportunity to use Log Viewer or Dropbox Text Editor)

.bak
.cache
.conf
.deb
.downloaded

1.2 Success

.css
.html
.ini
.json
.log
.m3u
.properties
.sh
.txt
.xml

2. Binary

2.1 Failure (don't have viewers installed for these, so this is to be expected)

.db
.jar
.zip

2.2 Success

.ico
.png
.xlsx

Dropbox 320.2.10 Android 12

1. Text

1.1 Failure (should give me the opportunity to use Log Viewer or Dropbox Text Editor)

.bak
.cache
.conf
.deb
.downloaded
.ini
.json
.log
.properties
.xml

1.2 Success

.css
.html
.m3u
.sh
.txt

2. Binary

2.1 Failure (don't have viewers installed for these, so this is to be expected)

.db
.jar

2.2 Success

.ico
.png
.xlsx
.zip