An image forming apparatus which is capable of performing more appropriate control of access to files which grant different access rights on a versions basis. The image forming apparatus is communicably connected to a file server. In a system controller of the image forming apparatus, a reading control section reads an original to thereby generate image data. The reading control section extracts version information on the original from the generated image data. Then, the system controller identifies, out of at least one version of an original file stored in the file server as electronic data corresponding to the original, a version that permits the image forming apparatus to perform image formation, based on the extracted version information on the original.