We are using Email to Case and have a lot of emails with attachments captured in the system. Customers use email from Salesforce with Attachments/Files to negotiate contracts and exchange invoice / purchase order documents with their customers. When the users from China send these out to customers and try and access / download the files from Salesforce files, they are seeing huge delay in preview / download times. Users outside the region have no issues viewing / downloading the files. The users now take about 10 - 15 minutes to download / view a 8 MB file that takes 2 seconds or less outside of China.
Please share any native or CDN / alternate solutions that might solve this problem.