Upload multiple files to GCP Bucket

Terraform
1

The objective is to take only the files from the dags folder for each metric and transfer them to a bucket, which needs to have this structure bucket/dags/metric_name/files.

The folder structure is like this:

Local:

metrics/
     a_metric/dags/
                  shared/files
                  files
     b_metric/dags/
                  shared/files
                  files
     c_metric/dags/
                  shared/files
                  files

My main.tf:

provider "google-beta" {
  project = local.base_vars.project
  region  = local.base_vars.region
}

locals {
  # Base variables 
  base_vars = yamldecode(file("base/vars.yaml"))

  
  #OK
  # Metrics subfolder names
  metrics = distinct([
    for dir_path in fileset("metrics/", "*/*/") :
    basename(dirname(dir_path))
  ])

  # Metrics configuration 
  metrics_config = flatten([
    for subfolder in local.metrics :
    [
      for file in fileset("metrics/${subfolder}", "vars.yaml") :
      merge(yamldecode(file("metrics/${subfolder}/${file}")), { subfolder = subfolder })
    ]
  ])



  metrics_paths = [ 
    for subfolder in local.metrics : 
{      for file in fileset("metrics/${subfolder}/dags", "**") : 
        subfolder => { 
          local_path = "metrics/${subfolder}/dags/${file}"
          remote_path = "dags/${subfolder}/${file}"
          }...}
    
  ]

}



resource "google_storage_bucket_object" "default" {
      for_each = local.metrics_paths
      
      name   = each.value.remote_path
      source = each.value.local_path
      bucket = "bucket_test_dags_terraform_001"
    }




# OUTPUTS
output "base_vars" {
  value = local.base_vars
}

output "metrics" {
  value = local.metrics
}

output "metrics_paths" {
  value = local.metrics_paths
}
output "metrics_config" {
  value = local.metrics_config
}

Error:

│ Error: Invalid for_each argument
│
│ on main.tf line 47, in resource “google_storage_bucket_object” “default”:
│ 47: for_each = local.metrics_paths
│ ├────────────────
│ │ local.metrics_paths is tuple with 3 elements
│
│ The given “for_each” argument value is unsuitable: the “for_each” argument must be a map, or set of strings, and you have provided a value of type tuple.
╵