Not directly. ESA and Robo portfolios are separate accounts, so moving money between them means withdrawing from one and depositing into the other.
The cost of that round trip:
- Several business days out of the market on each leg
- A transaction fee on the deposit side
- FX conversion on both crossings, since both sit in USD-denominated holdings
- Whatever gain or loss is realised at the point of sale
Because of this, ESA works better as a deliberate allocation than as a parking spot you shuffle in and out of. Decide what proportion of your money is short-term and leave it there.