Saving website behaviour has changed in Android browser

I have used Brave for about 6 months on a Samsung S4, I was a firefox refugee. I use website save a lot to read offline later. Recently I had to buy a new phone to get VoLTE, and it runs later Android. At first it saved websites the same way, as mhtml file which could then be viewed/opened in total commander. I allowed an update of Chrome one day and since then the new phone only saves a website as unknown text file and it can only be viewed using the downloads menu inside brave. My problem is that it shows a huge list whereas in a file manager I can browse the files I have saved so mhtml is more convenient. To complicate the issue further, I have installed the latest version on a different phone and it does it the right way. Is this a hidden config option I don’t know about?
Details:
2 phones which save as mhtml:
Brave 1.18.78 Chromium 87.0.4280.141
Android 5.0.1;GT-I9506 Build/LRX22C
Brave 1.19.88 Chromium 88.0.4324.96
Android 5.1.1;SM-J200Y Build/LMY47X

Phone which saves website as unknown text and must be viewed via downloads menu:
Brave 1.19.88 Chromium 88.0.4324.96
Android 10;5028D(Alcatel) Build QP1A.190711.020

At the moment I have to avoid saving on my new phone so I hope there is a fix.
Thanks,