system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How would time-travel to the future work?

In the MCU, time-travel works in that changes in the past simply create alternate timelines. So, what if I travelled to the future? 

Let's say I hide an infinity stone in 2154, only for it to somehow be stolen to complete the Infinity Gauntlet. Following the Snap, would I be able to retrieve the stone in 2154, moments before it is stolen?
gpt
There are already examples in the MCU of forward time travel. Ant-man basically traveled five years into the future, and that was basically the exact technology they used to go into the past. The effect is that the traveler shows up x years into a future where they've been missing for x years.

Agents of SHIELD went to the future using a Monolith, but those seem to use extradimensional energy so it spit them out into a future where they had all lived and died in the past already and they got to find out what they did wrong to create the apocalypse (small-a) timeline. They used the same method to go back and prevent it.