Good afternoon, I'm not used to the Apple tools and programms. We encountering the following issue : We have a zip file with an ipa file. According to our service provider, the Zip file contains the ios application which is presently already running on IOS (iphone, Ipad), only on the iphones and ipads of our team. The application is linked to the apple developer account of our service provider. Presently, this is the process we use to add the application on an IOS tools : We send the UDID of the tool to our service provider who generate an ipa file from the application. We put the ipa file in the following website : https://www.diawi.com/features-services The website give us an QRCode which we need to scan with the IOS tool, then, we have a pop-up on the tool for installing the application. It seems to be the process describing there : https://support.apple.com/fr-fr/guide/deployment/depce7cefc4d/web. As we won't work with our service provider anymore, we need to take back the control of the management of this application. We need to open the files in the .zip and we may have to modify them. I need some help to understand how to open them. I've tried on Xcode unsuccessfully. Could you please help to understand how to open and modify the application, linked it to our Apple developer account and distribute it to our employees or put it in the apple store ? Best regards.