Hi rockyhandsomee1210jx, welcome to Thunkable! 
Be sure to check out How to ask Great Questions v2.0, the Community Guidelines, and our Getting Started Guide to make the best of your Thunkable Community experience!
In the Thunkable Drag and Drop platform, you’ll want to use our Files blocks to allow your end users to select files from their device to bring into the app for processing. You can find more information in our Docs: