i have tried to send the list of 502 numbers for sms but i get error message thent

number of receipents exceeds than the group of MMS : [10] ?

why do i get it as it is clearly mentioned in yor api doc that 50 numbers list can be send for SMS/MMS per call.

https://support.ringcentral.com/article/RingCentral-Business-SMS-Frequently-Asked-Questions.html

8. Is there a limit to the number of recipients I can send an SMS / MMS to?

You can send an unlimited number of SMS / MMS to anybody in United States.

9. Is there a limit to the number of SMS / MMS that I can send?

You can send an SMS / MMS to up to a maximum of 50 recipients per SMS / MMS at once.

I'm getting a error while sending MMS by using C#

IOException: The process cannot access the file 'C:UsersDELLSourceReposCosmeticsOmsOms.WebwwwrootfilesRingCentral est_4e28.jpg' because it is being used by another process.

MY CODE

var attachment = new Attachment { fileName = model.FileName, contentType = imageType, bytes = System.IO.File.ReadAllBytes(filePathCopy) };

Seems the file is being open by another program in your computer. This may have nothing to do with the SDK or the API.

It is not a RingCentral or SDK issue. As the error message suggests, the image is being used by another process.

And the error message is thrown by System.IO.File.ReadAllBytes(filePathCopy) which is just plain C# code.

You could try quit other processes which is locking that file. Or you may make a copy of the file.