Select your cell and set it as input type file using the right menu.
- Accept: This will be set if you need to limit files uploaded depending on type. You can set:
- File extension:.jpeg, .gif,.zip,.docx
- image/*: all Images
- video/*: all Video files
- audio/*: all Audio files
- A valid media type: you can check the complete list at IANA Media types
- Multiple: Set to allow users to upload more than one file