Hi @이혜령 ,
Welcome to Q&A forum!
Please note that the tag office-powerpoint-itpro focuses on general issues about PowerPoint client, and issues related to Powerpoint for Android are not supported on Q&A forum currently. It is recommeded that you post a new question on the following forum for more professional help and support.
Microsoft Tech Community
Thanks for your understanding.
Besides, I also found this official article: PowerPoint for Android Tablets Help, please check if it helps you.
Hope you can solve your issue soon.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.