No problem
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Have you been living together already before applying for FLR(M)?
If so, do you have the required documents addressed to both of you at the same address for the relationship part of the application?
You need to provide 6 official documents in each name (either 6 joint or 12 separately addressed) covering the time that you have been living together, up to 2 years. They should be from at least 3 different sources and spread evenly over the time you've lived together. The acceptable document types are listed on the application form.
If you haven't lived together yet, then you don't need to provide anything, or if you have only recently started living together, then you just provide as much as you have so far.