Xero.NetStandard.OAuth2 9.1.0 CreateInvoiceAttachmentByFileNameAsync fails

[DaithiBradley]

SDK you're using (please complete the following information):

• Version [9.1.0]

Describe the bug
When attempting to update a file to an invoice in version 9.1 an exception is returned.

Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: T. Path '', line 0, position 0. at bool Newtonsoft.Json.JsonTextReader.ParseValue() at bool Newtonsoft.Json.JsonReader.ReadForType(JsonContract contract, bool hasConverter) at object Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, bool checkAdditionalContent) at object Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType) at object Newtonsoft.Json.JsonConvert.DeserializeObject(string value, Type type, JsonSerializerSettings settings) at T Newtonsoft.Json.JsonConvert.DeserializeObject<T>(string value, JsonSerializerSettings settings)

The response body from developer.xero.com for the API call shows:

The resource you're looking for cannot be found

When the package is downgraded from nuget package 9.1.0 to 8.1.0 the call works as expected with the same code.

Expected behavior
An existing invoice has a file attached to it.

Screenshots
None

Additional context
Nil

[github-actions]

PETOSS-567

[github-actions]

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