Copy items if neededusually (but not always, for example, the project already contains this element) copies files to the directory of your project, as a result you can safely use relative path(instead of the absolute one). For example, when you use any version control, your team members will not have problems resolving path problems
In the case of a third-party framework, you can use $(PROJECT_DIR)inBuild Settings -> Framework Search Paths
Create Groups vs. Create Folder Link
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