OCI list of documents and signature

Hi,
I am applying for OCI for two minor kids on the basis of Indian parents hokding ILR. My few query are as follows, any information would be really appreciated.
1) During application form i have uploaded following documents (Current UK passport, Previous Indian passport, ILR visa of parents, Marriage certificate, ) so my query is do i have to still carry photocopies as well or not ?
2) Is there anywhere documents list available which i can verify ? On top of above list, i am taking birth certificates, Passport surrender certificate
3) Is there any other declaration form needs to filled which is not part of application checklist ?

Thanks in advance

You need to carry self attested photo copies and original for verification.
You need to upload parents passport as well. Not sure what do you mean by "Previous Indian passport"
You need to upload Registration certificate, birth certificate of your kids