Hey @Lukin
In “data” field, I see you are mapping Bytes from trello. Please map “data” from trello in that field.
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You’ll need to use the HTTP Get a File module to download the attachment from the provided URL.
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Is there any other way? I cant use HTTP module I don’t have a full credentials to use it I have just oauth …
You can use the Trello universal module or HTTP Make an OAuth request.
If the external service has a Developer API Reference/Documentation then you should be able to integrate the endpoints in Make using the app’s universal module (Make an API call) or generic HTTP “Make a request” module.
You can also suggest for it to be made in the Idea exchange. Don’t forget to search for it first, just in case someone already suggested it, so that you don’t end up creating a duplicate.
If you need assistance in setting up the app’s universal module, or the generic HTTP module, please provide additional information about what you have tried with regards to the external service’s Developer API Reference – how you are setting the connection up, a link to the endpoint are you trying to connect to, and what errors you are encountering.
You can also complete this brand new course/tutorial in the Make Academy on how to use external APIs — API calls with HTTP modules
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For those who was same blind as me 
There is a module for Trello → Download an attachment. And that is the solution the output is DATA what is usable for the upload to Asana :). I don’t know if this module just popup in make or what but I would bet it wasn’t there before! 
