File attachments adding date and time to name when uploading?

File attachments adding date and time to name when uploading?

I have set up a function that uses the mail merger api to get a lead and fill in the details, it is basic but was just using to test will fill in all the details later, It works perfectly fine the only issue i have is that when it uploads the file into the attachments part of zoho crm it adds the date and time. I have checked the console and it doesnt do it when i just use info on the file i am uploading so unsure why this is happening assuming its some default value with the attach file api?

Any ideas how I can get rid of this or if i am making a mistake?