1. After opening Tik Tok, click the "+"sign in the middle below Tik Tok to enter the video shooting operation page. On the video shooting page, the video shot by Tik Tok is full screen by default. You can also select "Upload" at the bottom right to upload the video in the mobile phone photo album. As you can see, the uploaded video display is not full screen.

2. Open the phone desktop, find the Tik Tok icon, and then click Enter. After entering the Tik Tok page as shown in the figure, click the "+"at the bottom of the page to shoot, and then click the picture to upload the video. Then select the video to upload in the local gallery.

3.Tik Tok cannot be changed to landscape mode, but you can edit it to landscape mode when uploading video. Open Tik Tok app, click the plus icon, click the photo album to select the uploaded video, click the flip function in the lower right corner to switch to landscape mode, and click Next to publish successfully.