HowTo Add ISOs info

[sneakyx]

Hi,
I just downloaded some flavours of ubuntu 20.04 LTS and I tried to add them via multiboot USB (9.2.0) and I get the message "The ISO sleceted is not supported at the moment.
You can try booting ISO using memdisk...."

I'd like to contribute the missing infos for adding them to the supported ISOs, but I just don't know where to start. It would be nice to have some info about it- maybe in a docu or so.

[carriba]

Encounter the same issue as described here.

I did not yet figure out how to circumvent the same observed symptoms.