My undersanding is that other factions can use portals. (Such as when allied with Vaulters.)

However, when I create a new system improvment that creates a portal, only Valulters seem to be able to use it.

What am I missing?

I would make a SimulationDescriptor that would add 1 to property "CanUsePortals" that is defined in SimulationDescriptors[Empire] and add it to a Technology or something depending on who you want to have it, or just change its base value to 1 if you want to enable it for everyone

Not actually sure if this will work because I can't test it but the Vaulters Trait does this and it worked for me when enabling Material Expertise for everyone in the same way

Yup. That did it.

have you managed to do it? if you did, can you share it?

In my case, I was adding a portal building that any race could use.

It's just a matter of that improvement also adding 1 to the CanUsePortals property.

    <SimulationDescriptor Name="TemplePortal" Type="StarSystemImprovement">
        <Modifier TargetProperty="HasPortal"    Operation="Addition" Value="1" Path="./ColonizedStarSystemStateColony,ClassColonizedStarSystem" TooltipOverride="%TemplePortal_Tip" />
        <Modifier TargetProperty="CanUsePortals"    Operation="Addition" Value="1" Path="../ClassEmpire" TooltipHidden="true"/>
    </SimulationDescriptor>

hmm...it doesn't seems to show up in any race, i add it in "SimulationDescriptors[Empire]" and also in " ConstructibleElement_Industry[StarSystemImprovement] "

nope...doesn't show up in any races again...

Dunno what to say, it works for me.

Wait... What do you mean, "...doesn't show up..."

What doesn't show up?

i mean the "portal", the building dont show up in building list.

Well you'll need a working building before expecting CanUsePortals to work.

What I posted above was just an example snippet, not a full working building.

oh..my bad