I have an issue where I have followed the tutorial. Notes are getting uploaded but it comes up with 403 error when I attach a file in the app. I have tried the suggested solutions including “/” with invoke API url but it isnt working. I have tried deleting and remaking both the bucket and the federated ID pool.
this is the error. I used the IAM policy simulator and it said should be able to work. Any ideas? I am this close to throwing my computer out the window 
AccessDenied
Access Denied
175CC33390141C3A
6Ey/E7oO0AN6/UJudOoqukOf4m/To5y2y5+eHoFU1mMqqbWV2SQIx8M1ohAEUVW5L6eCCg4K4JE=