Hello, John
I second both earlier posters. Using YouTube Uploader 2.6 fails with the following output in the Debug Console of Dropzone 3.8.0 on Mavericks:
[Launching task with command line: runner.rb task-27234]
Task description file task-27234:
ACTION: "/Users/home/Library/Application Support/Dropzone 3/Actions/YouTube Uploader.dzbundle"
EVENT: "dragged"
VARIABLE: "access_token" "••••"
VARIABLE: "dragged_type" "files"
VARIABLE: "app_version" "3.8.0"
VARIABLE: "api_key" "••••"
VARIABLE: "expires_at" "1574882937"
VARIABLE: "refresh_token" "••••"
VARIABLE: "privacy" "Public"
VARIABLE: "support_folder" "/Users/home/Library/Application Support/Dropzone 3"
VARIABLE: "client_secret" "••••"
VARIABLE: "client_id" "••••"
VARIABLE: "https_proxy" "https://localhost:3128"
ITEMS: "/Users/home/Desktop/BrideGroom.mp4"
Determinate: 0
Begin_Message: Connecting to YouTube...
/Users/home/Library/Application Support/Dropzone 3/Actions/YouTube Uploader.dzbundle/youtube.rb:11:in `configure_client'
undefined method `send_timeout_sec=' for #<Google::Apis::ClientOptions:0x007feb93337328> (NoMethodError) from /Users/home/Library/Application Support/Dropzone 3/Actions/YouTube Uploader.dzbundle/action.rb:22:in `dragged'
from /Applications/Third Party Software/Other Utilities/Dropzone 3.app/Contents/Actions/lib/runner.rb:75:in `call'
from /Applications/Third Party Software/Other Utilities/Dropzone 3.app/Contents/Actions/lib/runner.rb:75:in `<main>'
[Task completed]
When I use v2.1 it fails to upload with the authorization error although I can authorize both versions seamlessly during set-up.