It's now possible to replace a Takeoff drawing with a revised version.
To do this, follow these steps:
  1. Navigate to the "Takeoff" page
  2. Click the 3 dots beside the drawing you wish to replace
  3. Click "Replace drawing".
Replacing a drawing keeps all existing work intact, though the size & orientation of the PDF needs to be the same for your work to correctly line up.
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This is particularly helpful when dealing with revised information.
If the majority of drawings have been revised, you may still prefer creating a new takeoff or adding new disciplines for the revised information.
However, if only a handful of drawings have been revised, then drawing replace will be a huge help.