FileNet has the option to use cloud storage, e.g. S3 storage devices with an "Advanced Storage Area"
Please find more details in the FileNet Knowledge Center:
You can have several storage areas, e.g. on premise and on cloud and use a sweep job to move content from one storage area to another:
Yes Mahamood, you need to update to a newer supported version. The principle of moving content between Storage areass is transparent to the user, so the answer is yes, the end-users will be able to access the content after you move the documents to a new storage area.