Multiple "Save to Download" does not work

[gjf]

Describe the bug When chosing several files in one channel to "Save to download" only one is saving, although the whole mechanism is not reliable and needs to "save to download" once again after finish of downloading to make the file really appears in corresponding folder.

To Reproduce Steps to reproduce the behavior:

1. Find any channel that proposes files to download.
2. Choose any file and choose "save to download" from menu.
3. Before the download finishes choose another file in the same channel and also "save to download"
4. Downloading of previous file will stop - but it can be resumed again. Anyway: one file only can be downloaded in a moment.
5. Even when download process finishes - the file will not appear in ccrresponding folder: you need to choose the file and "save to download" again - looks like automatic copy from the cache is broken.

Expected behavior Multiple files should download simultaneously and appear in a corresponding folder after the process finishes.

Smartphone (please complete the following information):

• Device: Oneplus 7T Pro
• OS: Android 11
• Version v8.8.5-rc01