As revealed in the official Nintendo Switch 2 promotional magazine:

The screenshots and videos stored in the “Album” on your Nintendo Switch 2 can now be accessed effortlessly via the ‘Nintendo Switch App’. This app allows you to explore, save your favorite moments directly to your smartphone, and seamlessly share them across social media platforms.
– With this innovative feature, you can wirelessly transfer screenshots and videos from your Switch 2 to your phone without needing to remove the memory card or connect to a computer.
– The app also lets you browse through all your saved content directly, making it easy to relive your gaming adventures.
– If you choose, you can store these memories locally on your device or instantly post them to your favorite social networks.
Note: Starting late May 2025, the current “Nintendo Switch Online” mobile app is expected to undergo a rebranding and will be renamed to the new “Nintendo Switch App”.
This seems like a game-changer for sharing epic moments! I can’t wait to try it out and finally free up space on my Switch. It’s so convenient that they integrated this feature into their app. Social media sharing just got a whole lot easier!