[BUG] DownloadHttpFile Activity - Using storage : workflow variable will result in a server error

[MariusVuscanNx]

Description

Using a workflow variable storage for a DownloadHttpFile activity will result in an error.

Steps to Reproduce

1. create a simple download file workflow like so:
2. in the download file: output : result -> set the Result to a variable.
3. have the variable declared like so:
4. call the http endpoint

4. Reproduction Rate: Every time.

5. Video/Screenshots:

Expected Behavior

No error should be thrown, maybe not allow variables of that type to be used for the activity.

Actual Behavior

Error is thrown.

Environment

Client version: 3.2.0-rc2 Server version: 3.2.0-rc2

Additional Context

If you se the variable storage type to memory, the error disappears.