Hi @Proway
You have to use Dynamic DataSource, just like @CarlosFigueira mentioned.,
Save your Excel in DropBox (fastest response in 5 sec) oe OneDrive or GoogleDrive.
1. From PowerApps, get it connected to your, say Dropbox (it will direct you to Website and sign in with your credential)
2. Then, move your excel file into Dropbox. (Latest Update: Excel fil does not need to be in a folder, and then share to other Dropbox. Just additional info)
3. Finally, when you are in PowerApps, and select View - DataSource - DropBox - ExcelFILEYOUNEED - you can see TABLES (which is already formatted in your excel file).
From here, you can now enter data as in the cloud.
Hope this further helps to clarify.
TQ