The sentence that correctly uses punctuation to show a quick change between ideas is:
"Did you hear from Steve about oh, and be sure to take out the yes I know his graduation is coming up."
This sentence includes an interruption in thought, effectively using punctuation to indicate a shift in focus. However, it may still need clearer punctuation and adjustments for clarity.
That being said, the most conventionally correct sentence with proper punctuation usage is:
"After you get back from your trip, be sure to upload photos, check your mail, and water your plants."
This provides a list, demonstrating proper punctuation. But if you're looking specifically for a quick change of ideas, then the first sentence could have shown that, albeit less conventionally.
If you need clarity or further explanation for each, let me know!