Zip file uploading error

Problem 1:

curl -X POST ‘http://34.239.120.98:8065/api/v4/uploads/tzku9ayprbnjidn73b48ccpnrh’ -H ‘Authorization: Bearer 9bjfkp9irfri5n7ag43k6okpqa’ --data-binary @/home/ragvendra/Downloads/example.zip

{"id":"app.upload.get.app_error","message":"Failed to get upload.","detailed_error":"resource: UploadSession id: tzku9ayprbnjidn73b48ccpnrh","request_id":"eruap8eyw3gzxkmr8es53u8zha","status_code":404}

How to create a new upload session ?

Problem 2:
curl -F ‘file=@/home/ragvendra/Downloads/terraform-main.zip’ -F ‘channel_id=tzku9ayprbnjidn73b48ccpnrh’ --header ‘authorization: Bearer 9bjfkp9irfri5n7ag43k6okpqa’ http://34.239.120.98:8065/api/v4/files

{"id":"api.context.permissions.app_error","message":"You do not have the appropriate permissions.","detailed_error":"","request_id":"ygbeqorzjid1prom5s6t7s5rqo","status_code":403}

How to fix this?