Hi @Julia31704841jjv0,
Are you getting any error messages while accessing old files? Can you share a screenshot or screen recording of the workflow with the issue you face for us to understand?
Old files are accessible when you select Your Stuff > Access files in the highlighted tile. Once you convert the old file, you'd see it in the Your Stuff section, and you'd also see a new folder [Originals]; this folder will hold your old projects which you choose to convert.