v4 plugin not usable in app on ios

[sdetweil]

I have a v4 plugin, which uses a vendor framework. drag/drop into xcode project.

builds without problems.

passes npm run verify and npm run build.

has vendored_frameworks set in it's podspec file.

npm install it in the app and the framework files are present in the app directory tree.
the editor sees the plugin methods.

np cap sync ios
works with no issues ( failed before vendored_frameworks added to plugin podspec)

xcode build of app fails, plugin xxxPlugin.swift import of framework, module not found.

this code compiled ok in the plugin xcode project

so this says either the copy was incorrect, or the vendored_frameworks didn't work as expected, or there is a path problem in the app build

but I don't know xcode enough to debug.

can anyone help?