As Binky said... Why would you want to??
There is no obligation to have to upload copies of any certificate(s) to anywhere..
Providing you issue appropriate certificates to all customers where you have undertaken work requiring any one of the certificates/reports as per the model forms in BS7671..
AND... you have access to copies of the certificates/reports you have issued...
Then all is good... :Salute
( don't forget hand-written hard-copy certificates are still perfectly acceptable...
and they cannot be uploaded!!)
Along with the address, date, & type of work completed, I think the only other info you may be required to submit is a certificate serial number?
Just adopt whatever certification method best suits your working methods and filing system..
and don't worry about non-essential tasks.
( p.s. welcome to the forum.. Guinness though Pubs may be 'Covid-closed'.. Our virtual bar is stocked and fully operational! )