While some platforms technically allow you to upload lyrics directly, this can be legally problematic if you're not the sole owner of the composition. If you have co-writers or a publishing deal, you likely don't have the unilateral right to distribute lyrics.
Most publishing agreements grant lyrics rights to the publisher, meaning they should handle distribution through proper channels. Even with co-writers who aren't published, you'd need their agreement before uploading shared lyrics. The safest approach is to work through your publisher or a lyrics aggregator who can ensure proper rights clearance and attribution.
For independent songwriters who own 100% of their compositions, direct upload may be possible. Consider whether you want to manage lyrics across multiple platforms individually or use an aggregator for broader distribution.