Add an attachment to an existing message in an existing RMA

Add an attachment to an existing message in an existing RMA.
Sample Curl
curl --location --globoff 'https://mygatewayurl.com/V1/storeview/default/dashboard/returns/return/message/5/attachment' --header 'Authorization: Bearer o1puu2ye124c8x7rf1tm6kcnxkjyovza' --header 'Content-Type: multipart/form-data; boundary=

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Path Params
number
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string
required

The Store view code refers to a specific store view within a store. A marketplace can have multiple websites, each website can have multiple stores, and each store can have multiple store views. Available store view codes are listed in the admin portal under Stores > Settings > All Stores. For example, the store view code for the French store view might be fr

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