I want to develop a Power App which support offline mode, so users can open the power app >> go to the down floor where there is not internet connection >> fill out the form >> take some pictures from his/her mobile device >> once there is internet connection the item got saved to SharePoint. Now i am reading this article which talk about Offline mode in power apps @ Develop offline-capable canvas apps .. where the link mentioned the following note:-

so i am a bit confused on what does Power Apps Mobile exactly means? Does it refer to the Power Apps we can accessed from our "Power Apps" mobile application we can install inside our smart phones? or it means that the Power App itself need to be available inside Apple store or Google Play as a mobile app?
Second question, if we customize a list form using Power app >> then we access the power app (the customized list form) using a web browser inside the mobile or PC then this power app can not support offline mode.. is this correct?
Thanks