I have my own cloud storage and own file management system, I am trying to integrate with Microsoft and Google in order to add a document online editor to permit my clients to collaborate and share content.
I have started working with Microsoft using their Cloud Storage Program and using WOPI protocol, and everything is going fine till now.
On the other side, I haven't found a similar one for Google :/, there's something called Google Drive API, but it seems only for documents stored on their cloud.
I have got inspired by what Dropbox is doing for online document editors using both Microsoft and Google.
Does anyone know how it is feasible with Google?
You could have a look at Google sheets api , or google docs api. They will let you programmatically edit files.
But there is no wysiwyg editor really for drive. Unless the user has access to the file, and it resides in drive then they could open it in the google drive web app on their own account.