Azure Logic App Standard - Some of the connections are not authorized yet - azure-logic-apps

Question

I'm creating a logic apps standard workflow hosted in an ase v3. I have the built-in file system connector to collect from an on-prem file share. I was able to create the workflow in the azure portal. However, when I return to it and click save I get the following message:
Some of the connections are not authorized yet. If you just created a
workflow from a template, please add the authorized connections to
your workflow before saving
The code for the workflow is shown below:
{
"definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"actions": {
"Copy_file": {
"inputs": {
"parameters": {
"destination": "destination_path_here",
"source": "#triggerOutputs()?['body']?['path']"
},
"serviceProviderConfiguration": {
"connectionName": "FileSystem",
"operationId": "copyFile",
"serviceProviderId": "/serviceProviders/FileSystem"
}
},
"runAfter": {},
"type": "ServiceProvider"
}
},
"contentVersion": "1.0.0.0",
"outputs": {},
"triggers": {
"When_a_file_is_added": {
"conditions": [
{
"expression": "#not(equals(triggerBody().Size,0))"
}
],
"inputs": {
"parameters": {
"folderPath": "source_path_here"
},
"serviceProviderConfiguration": {
"connectionName": "FileSystem",
"operationId": "whenFilesAreAdded",
"serviceProviderId": "/serviceProviders/FileSystem"
}
},
"kind": "Polling",
"recurrence": {
"frequency": "Second",
"interval": 15
},
"splitOn": "#triggerOutputs()?['body']",
"type": "ServiceProvider"
}
}
},
"kind": "Stateful"
}