To record Nintendo Switch games as videos and upload them to TikTok, you need to use a screen recording device and connect it to the Switch and your computer or mobile device.

Here are some steps:

Get a screen recording device. You can connect the Switch to your computer or mobile device using a video capture card or a USB-C to HDMI adapter.

Connect your devices. Plug the video capture card or converter into your computer or mobile device and plug the Switch into the HDMI input port of the device. If you are using a USB-C to HDMI adapter, connect it to your mobile device using the USB-C port.

Install screen recording software. Depending on the screen recording device you are using, download and install the appropriate screen recording software.

Record a game. Launch the screen recording software and select the game you want to record. Start recording the game and follow the instructions of the software.

Export the video. After you finish recording, export the video and save it to your computer or mobile device.

Upload videos to TikTok. Open the TikTok app and select the video you want to upload. Select the video and edit it, then upload it to your TikTok account.

Please note that you may not be able to record certain gameplay due to the Nintendo Switch Terms of Use. Also, make sure that your actions of recording and sharing gameplay videos do not infringe copyright or other legal issues.