Most journals require that the authors sign an agreement in which the publisher retains the copyright of the paper (e.g. [1]).
Although a few publishers allow the authors to provide a pdf of the paper in their personal home-page, they do allow it to be uploaded to an open access platform.
Although a few publishers allow the authors to provide a pdf of the paper in their personal home-page, they do allow it to be uploaded to an open access platform.
[1] https://www.elsevier.com/about/company-information/policies/...