Abilities that have an alt cast will cast when trying to upgrade them if you have the "Press and hold" option for alt cast mode.

[steventheeven3]

If you have the "Press and hold option" selected for alt casting abilities, when trying to upgrade abilities using keys (either tab + ability key, or your custom keybind), abilties that have an alt cast, such as dynamo 2, Viscous cube, doormans 2 and 3 , etc, will automatically cast when trying to upgrade them.

This also includes Mina's sanguine retreat, possibly because it was maybe coded using dynamo's 2, even if it doesn't have an alt cast for her.

I did not test the "Double tap" option, but the "alternate key" option works fine with these abilities.