I'm trying to upload an image to a bucket on Google App Engine. The php code sample here works:
https://cloud.google.com/storage/docs/uploading-objects
I use the below code to get $source for the above:
https://cloud.google.com/appengine/docs/standard/php/googlestorage/user_upload
However, it says this solution (createUploadUrl) is not recommended, and it only works on my development server, not my production server. What is the proper way to get a file path using Google App Engine?