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Use Application.persistentDataPath for a folder location that is writable. On many platforms, the streaming assets folder location is read-only you can not modify or write new files there at runtime. For an example, see Application.streamingAssetsPath.

To read streaming Assets on platforms like Android and WebGL, where you cannot access streaming Asset files directly, use UnityWebRequest. Android uses files inside a compressed APK/JAR file, "jar:file://" + Application.dataPath + "!/assets".iOS uses Application.dataPath + "/Raw",.macOS player uses Application.dataPath + "/Resources/Data/StreamingAssets",.Most platforms (Unity Editor, Windows, Linux players, PS4, Xbox One, Switch) use Application.dataPath + "/StreamingAssets",.The location returned by Application.streamingAssetsPath varies per platform: It’s always best to use Application.streamingAssetsPath to get the location of the StreamingAssets folder, as it always points to the correct location on the platform where the application is running. To retrieve the folder, use the Application.streamingAssetsPath property. Unity copies any files placed in the folder called StreamingAssets (case-sensitive) in a Unity Project verbatim to a particular folder on the target machine.

An example of this is the deployment of a movie file on iOS devices the original movie file must be available from a location in the filesystem to be played by the PlayMovie function. However, it is sometimes useful to place files into the normal filesystem on the target machine to make them accessible via a pathname. Then save it to persistentDataPath: File.WriteAllText(Application.persistentDataPath + "data/MyFile.Unity combines most Assets into a Project when it builds the Project. Result = System.IO.File.ReadAllText(filePath) String filePath = System.IO.Path.Combine(Application.streamingAssetsPath, "MyFile") Put the file in StreamingAssets folder then read it with the Load from StreamingAssets: IEnumerator ReadFromStreamingAssets() I suggest you don't use it but it's an option that's worth knowing.

The Resources folder is known to increase loading times. After that you can copy the loaded data to the Application.persistentDataPath directory. You can check if this is the first time the app is running with this. TextAsset txtAsset = (TextAsset)Resources.Load("textfile", typeof(TextAsset)) You can put the file in the Resources folder from the Editor folder then read with the Resources API.