Leukaemia Foundation linked 6k+ files with their Salesforce system by keeping the files in Amazon S3

Our client was dealing with a huge number of Salesforce files. And they wanted to link around 6K+ files from another CRM software with Salesforce objects such as accounts. The other challenge was a
seamless collaboration of existing files as well as newly added files
(placed in the external system) with their Salesforce system.