Currently, we don't have the option to schedule reports periodically or view specific interface data in custom reports. However, you can view Interface Traffic data by navigating to Reports > Network Device from the Site24x7 web client. Under the Top N & Bottom N Report section, select Interface by In Traffic and Interface by Out Traffic reports. You can send these reports to configured contacts periodically.
For this, Site24x7 allows an automatic schedule for Interface by In Traffic and Interface by Out Traffic reports in the Top N & Bottom N Report section. You can select the option after clicking on the Share This button. Please refer to the below screenshot for details.
That said, we understand your requirement and realize its importance. We'll make sure to implement this functionality in future releases and will post an update here once the feature goes live.
Hope this helps. Feel free to add your feedback as comments below.
Also, it looks like the attachment is missing here. It would be helpful if you could add that, as well.