Some websites offer the opportunity to upload research work manuscripts for the purpose of getting more audience before publication. Does this help getting more citation? or is it better to wait until publication?
In addition, a published paper is a published paper; all others are drafts. In this case, no citation can be expected, unless the pre-print is published.
However, a pre-print lets your work known to peers and adds to the kitty of storage websites.
In essence, it serves more to the website than the author.
Preprints may be cited like any other published papers. It is a good idea to use the concept of versioning when uploading preprints at a different stage of their refinement. See e.g.: https://blog.zenodo.org/2017/05/30/doi-versioning-launched/