The standout addition for this version was improved support for , specifically tailored for the iPhone X and newer iPad resolutions. Beyond mobile-centric updates, it addressed several performance bottlenecks:

Released in April 2018, was a critical maintenance update for Apple’s free video editing software, primarily designed to bridge the gap between desktop editing and the then-new mobile hardware. While it is an older version today, it remains a common target for users running legacy macOS systems like High Sierra (10.13.2 or later) who need a reliable, free editor. Key Features and Fixes in Version 10.1.9

Addressed slow media imports from SD cards on iMac Pro and fixed a recurring hang-on-quit issue.

Fixed a bug where HEVC video clips and HEIF photos appeared as black frames in the viewer.

Resolved issues preventing Facebook logins and improved the stability of project transfers to Final Cut Pro .

Fixed disappearing opacity controls for users in Poland and Germany. imovie 10.1.9? - Apple Support Community