Save email attachments to Nextcloud

This workflow will take all emails you put into a certain folder, upload any attachements to Nextcloud, and mark the emails as read (configurable).

Attachements will be saved with automatically generated filenames:
2021-01-01_From-Sender-Name_Filename-of-attachement.pdf

Instructions:

1. Allow lodash to be used in n8n (or rewrite the code...)
   NODE_FUNCTION_ALLOW_EXTERNAL=lodash (environment variable)
2. Import workflow
3. Set credentials for Email & Nextcloud nodes
4. Configure to use correct folder / custom filters
5. Activate

Custom filter examples:

• Only unread emails:
  Custom Email Config = ["UNSEEN"]
• Filter emails by 'to' address:
  Custom Email Config = [["TO", "example+invoices@posteo.de"]]