Intermittent error when creating invoice attachments

[Anonymous]

We are saving customer invoices and creating attachments for them in large batches, but we are seeing intermittent errors when creatig the attachments, with response code 500 from the API. The attachments we are creating for the invoices always have the same content and file name, so there is no difference for the ones succeeding and failing. Examples of message returned when we get error code 500:

{"message":"VismaId: ff6b674c-8647-4e00-b190-afb0dc4c2f45. Safe handle has been closed"}

{"message":"VismaId: fa7417f2-3741-4593-9af3-878c942eeb3d. One or more errors occurred."}

{"message":"VismaId: 021077a8-b14a-4b47-aece-fef5d2014da2. Could not save the attachment"}

{"message":"VismaId: 05c2923c-64a3-4da2-beeb-188cdabea513. Could not save the attachment"}

[Yıldırım]

Hello, 

How often do you receive the error messages ? When was the last time you've received, could you please send us ipp-request-id from the latest failed transactions ? Please also include your POST > Attachment snippet. 

Thanks.