Review Created JSONs
With this tool you can select a created JSON file (on the source site) and its contents will be displayed in a user readable format. Checkout this document's Appendix section for details on the intermediary JSON file format.
JSON File Sizes
This tool will show the total size of all linked files in each JSON file on the target site. Check this and compare it to available disk space on the target site so as to assess how much disk space the import will take.
It may be necessary after importing/merging sites to convert any new media files (Audio or Video items) so that they fully function with Jamroom. This tool will check all media files and if necessary, queue them for conversion.