When you need to migrate a large number of documents into Appian, first consider whether you need to maintain metadata or associations with other data from the old system. Appian supports bulk uploads via the Appian Designer interface. The out of the box approach will be a significantly faster solution than designing and testing a migration process. This is a valid approach if the following conditions are met:
If your migration can't be accomplished using bulk upload, use an Appian process (or processes) to run the migration and track progress using a database table.