Andoid FF, How to open a jpg by QuickPic?

[takfuji]

Using FF 66.02 on Android 8.0. Want to open a jpg file by QuickPic or F-Stop, but cannot.
When I long-touch a link which should open a jpg file, FF asks which link to use. I choose "Open by application."
FF now asks "which application?", and lists installed applications such as Gallery, X-plore image viewer, etc,
but QuickPic/F-Stop is not in the list. It's installed, of course.
How can I set FF to let QuickPic/F-Stop be listed?
Tak

[makaiguy]

... but QuickPic/F-Stop is not in the list. It's installed, of course.
How can I set FF to let QuickPic/F-Stop be listed?

Merely guessing here, but it sounds like your Android setup doesn't have those apps registered as being for jpg files, so this is really an Android question, not a Firefox question. Have you tried asking in an Android support forum, like https://support.google.com/android/?hl=en#topic=7313011?

[takfuji]

OK, thanks.
Visited the URL, but not helpful. Will give up.
Tak