Dear. Who can tell me how to get the full length file of a pack like displayed in the preview. I received multiple individual files…
Contact the author you bought it from or contact customer support?
The preview file is individual files put together to one file, the download always consist of those files separated. This is the way Envato insists of doing it, instead of showcasing them the way buyers get them. Like CWMusic says, you could reach out to the author to hear if they can provide the preview file without watermark. This is not something Envato support will be able to assist you with.
Thank you very much for your help!