I was gonna make a topic about this and probably still will in the WIshlist or Bug Reports.
I noticed in the new EFB, if you dig far enough you can find this option.
with this in mind, this is the same UI popup that is displayed in MSFS 2020 and it even says that you can also Save/Load FLT files however this is not the case as you can only save and load PLN files.
Hopefully they will fix it in a later update, and hopefully its still gonna be a feature and not considered obsolete