Yes. For transcripts, go to the Academic page of your application and click on your school name. At the bottom of the dialogue box you will see the option to preview the document that you uploaded.
For test score reports you will see the preview option on the Testing and Honors page in the "Submit Test Score Report" section. If you have uploaded multiple test score reports, click on "Upload, preview, or delete additional test score reports" at the bottom of this section to preview all of your files.
You can also view all of your upload materials at the end of your Application Proof, linked at the bottom of your Manage and Review and Submit pages (when available).