The doi on the page is for the open-access abstract.
The file has the abstract text, and the rest of the file is mine from a UTHSC presentation. Can I generate a second doi for the PDF file at https://www.researchgate.net/publication/275162220_What_Is_a_Powder_Burn#fullTextFileContent?
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If not, and if I publish a revision that explains the abstract without a direct copy on my website, can I generate a doi?
You should not generate a new DOI for a research item that already has one, as this will potentially lead to confusion.
ResearchGate DOIs
https://explore.researchgate.net/display/support/ResearchGate+DOIs
DOIs are unique identifiers assigned to digital documents, such as research papers, articles, or datasets, to provide a permanent link to their location on the internet.
If you have published a revision of your work and want to assign a DOI to it, you would need to contact the appropriate DOI registration agency or service provider to request a new DOI for the updated version.
Keep in mind that DOIs are generally associated with unique and fixed versions of digital content. If you publish a revision with changes to the abstract or content, it is recommended to have a separate DOI for each version to maintain proper citation and tracking of the different versions.
If you have questions about DOIs or their assignment for your work, consider reaching out to the publisher or your institution's research support services for guidance on how to obtain a DOI for your revised publication.