Yes, just navigate to the task details and select “Attach file” or drag & drop it into the area. You can add one file at a time, but as many files as you like.
You are also able to add files to comments in the activity log. You you need to upload them with a comment.
Files that you attach to a comment will automatically appear as attachments in the task.
If you delete a comment 🗑, the attached file is not directly deleted from the task.
The attached files of the task will automatically appear in the project files if the necessary read permissions for the task are available. Here you can read more about the project files.