2.20.1

Fixed

• preview_frame images show the comp's background in its own colour. After Effects writes the background as transparent pixels, which clients drew white, so light text on a dark comp looked invisible or washed out and a model could "fix" a design that was fine. The returned image is now opaque and matches the comp exactly (the edges were already blended).
• set_layer reads back every field it sets: adjustment, guide, effects, audio, quality, sampling, collapse, time_remap, frame_blending, auto_orient, separate_dimensions, preserve_transparency, solid_color and solid_size were left out of its result.
• import_footage as: sequence refuses a file whose name has no frame number. After Effects took every image in that folder as one sequence named after the folder.
• A layered PSD or Illustrator comp import says its duration comes from After Effects' still-footage preference (it was 102.9 s), and its <name> Layers folder moves into folder with the comp.
• About 50 errors now say what to do next (a missing file names the allowed folders, a move starting before 0 s says to start later, stagger on a property with no keys says to animate it first, and so on).

Verified

• Blend modes and adjustment layers, from preview pixels in After Effects 26.3, now part of the live tests.