Hi
From your screenshot, there is an arrow on your project_CAN2 folder, this means it is a linked folder but not a folder existing in your project folder.
How to create a linked folder in your CW project window: drag the folder directly under your project window under CW IDE, it will pop up dialog like this

select the second item. Only the files and folders dragged in are added as linked resource.
this will create a linked folder.
to add a file inside this linked folder: you just need add the file inside this folder in windows file explore.
then go back to CW IDE, close the project and reopen it, we will see the file is added to folder automatically.
Have a great day,
Jennie Zhang
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