set sync default to false

roles/matrix-synapse/defaults/main.yml

@@ -585,7 +585,7 @@ matrix_synapse_s3_media_store_local: false
 # Save media on remote media store
 matrix_synapse_s3_media_store_remote: true
 # Synchronous upload 
-matrix_synapse_s3_media_store_sync: true
+matrix_synapse_s3_media_store_sync: false
 
 matrix_synapse_s3_media_store_bucket: ""
 matrix_synapse_s3_media_store_region: "eu-central-1"

roles/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -1023,7 +1023,7 @@ federation_rr_transactions_per_room_per_second: {{ matrix_synapse_federation_rr_
 
 # Directory where uploaded images and attachments are stored.
 #
-{% if matrix_synapse_s3_media_store_local or not matrix_synapse_s3_media_store_enabled %}
+{% if matrix_synapse_s3_media_store_local and matrix_synapse_s3_media_store_sync or not matrix_synapse_s3_media_store_enabled %}
 media_store_path: "/matrix-media-store-parent/{{ matrix_synapse_media_store_directory_name }}"
 {% endif %}