You must first deposit your manuscript or RR snapshot on a preprint server (e.g. bioRxiv, arXiv, etc. for manuscripts; for snapshots, please deposit your PDF at OSF or a similar repository and not at Google) or the Open Science Framework, and obtain a DOI if the submission is public. At Stage 1 you can keep the manuscript or snapshot under a private embargo provided PCI RR is provided with a view-only URL.
Your report must not be published or under consideration for evaluation elsewhere at the time of its submission to PCI Registered Reports. If your report is sent out for review by PCI Registered Reports, you are not permitted to submit it to a journal until the PCI Registered Reports evaluation process has been completed.
You cannot, therefore, submit your report to a journal before its rejection or recommendation by PCI Registered Reports.
Details about the evaluation & recommendation process can be found in the Guide for Authors.