I can not Attach a file as an attachment to the request

I can not Attach a file as an attachment to the request

Dear Sir/Madam,
 
I can not Attach a file as an attachment to the request after about adding 10 request with attachment files.
It show the error  "the maximum attached file size is 10MB" and also happens repeatedly after adding about 10 requests in Service-Desk system and I must close the new incident page then open it and finally add the request with the attached file.
Please be informed that the attached file is less than 1MB in size and is bout a few KB.
 
Best Regards,

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