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In general Ides organize projects internally and to add a file to the project you need to do perl IDE, you cannot just paste into the project folder.
It is questionable for an IDE to monitor the folder to add a file pasted there automatically.
In the case of Xcode is next to the creation of the project, Add Files To
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I never used the Xcode but just paste is not enough, you have to include in the project.
– Maniero
found here, click on the project printer > Add Files to "-"
– Edson Reis
sorry the stupid question xD, is that some platforms need not include as for example android studio, as I saw no place to give include thought it was some bug...
– Edson Reis