more robust file upload

[suhlrich]

Figure out error in spotty wifi. Options
-try multiple times
-find a more robust library

[suhlrich]

Some ideas:

• upload file directly, not using multipart forms (Super slow uploads (10x time) on 1% packet loss connection Alamofire/Alamofire#3471)
• use [use a URLRequest directly] instead of alamofire (https://developer.apple.com/documentation/foundation/url_loading_system/uploading_data_to_a_website)
• retry in alamofire (https://medium.com/swlh/retry-request-using-alamofire-52c7dcd72175, or this one seems easier: https://medium.com/@daljeetseera9668/retry-api-calls-with-alamofire-51d2a36c07b9)