Reword guidance in file-upload Web UI for clarity
Reword guidance in file-upload Web UI for clarity

validator/validator,validator/validator,takenspc/validator,validator/validator,takenspc/validator,tripu/validator,takenspc/validator,tripu/validator,validator/validator,validator/validator,tripu/validator,takenspc/validator,tripu/validator,takenspc/validator,tripu/validator