Pathfinder 2E Spellstrike question

[Yardiff]

Can a Magus us any spell slots they have available to them for a Spellstrike if that spell meets the prerequisites of Spellstrike.

Example: a Magus with a multiclass spellcasting archtype like Druid or Cleric.

Or is Spellstrike limited to the Magus spell slots only?

 

[JThursby]

From the spellstrike action: "You Cast a Spell that takes 1 or 2 actions to cast and requires a spell attack roll." Nothing in the language says that the spell being cast must be from your Magus spellslots or cantrips, other sources work just fine.