Incorrect. Use a “Get a file” module first.
the “play” variable does not contain the actual video contents.
Does the Module Require You to Map File Data?
Did you forget to download the file using the file’s link/URL? If it’s not downloaded to the scenario, the next module can’t access the file binary data (contents).
To do this, you can use the HTTP “Get a File” module with the file URL that you need to download. Your file has to be publicly accessible on the internet (doesn’t require authentication).
For more information, see Working with files - Help Center.
More Than One File?
If you have an Array of multiple file URLs, you can use an Iterator module, and map the resulting bundle value/URL to the “Get a file” module.
To download multiple files before proceeding to the next module, you can use an Array Aggregator.
Hope this helps! If you are still having trouble, please provide more details.
— @samliew