Goa
Can you play an expedition card in the middle of an action to get more from that same action?
Several experienced players agree; editions differ on mid-action details and there is no official ruling.
No. You cannot interrupt an action with a card to reuse a tile or to fill more space than the action allowed. The rulebook says non-A cards may be played before, during or after an action, but in practice only a few cards (such as the colonist cards while founding a colony) make sense mid-action, and editions differ on exactly which. Cards with an A symbol are played with the action they change.