A main asset is a character, environment, or object your script depends on. These are what show up in Key Assets so you can confirm their look before moving to the storyboard.
Sometimes ByThen won't pick up a main asset from your script, even if you clearly intended one. This usually comes down to how the main asset is written or referenced in your script.
Why this happens
Your main asset is only mentioned once or briefly, without enough description for ByThen to treat it as a recurring character, environment, or object
Your main asset is referred to inconsistently (different names or descriptions across the script)
Your main asset is described too vaguely to be distinguished from a supporting asset
How to fix it
Introduce your main asset clearly, with a name or consistent description the first time it appears
Use that same name or description every time your main asset shows up in the script
Add a short physical or visual description if you want ByThen to lock in a specific look
Avoid referring to your main asset only by pronouns or generic terms (like "he" or "the man") after its first mention
If it's still not detected
Go back to the Key Asset confirmation page before the Key Assets landing page. From there you can manually add your main asset if it's missing from the list, then continue on to Key Assets to confirm its look.