Please note that you wrote to the ResearchGate community, not to the RG team. However, you may try to solve the problem with the following hints:

1. Did you create already pages for these papers? Rather often there are problems when starting the "Add new" process with file upload. Better click on "Skip" and type the bibliographic data in to create the page. After this, you can upload the PDF file. See also my reply to this related question: https://www.researchgate.net/post/I_cant_upload_a_book_chapter_because_it_wont_let_me_type_my_name_as_the_authors_name_in_the_box_Why

2. There seems to be a limit of 80 MB for the file upload, at least a user found this some time ago. But this may have changed meanwhile.

Dear Batool S Hassan Al Lawati In addition to what is indicated by Wolfgang, I think your problem is that the papers are already present in RG. Is my impression right that the papers listed in the following profile belong to you?

https://www.researchgate.net/profile/Boshra-Hassan

If that is the case than you can do several things:

-I guess first of all you can include more names (alternative names) under which you have published in the past https://help.researchgate.net/hc/en-us/articles/14292798510993-Authorship

-You can merge both profiles https://help.researchgate.net/hc/en-us/articles/14292803187473-Duplicate-profiles

-If not working 100% or not at all, you can claim authorship of the papers mentioned and listed in this profile https://help.researchgate.net/hc/en-us/articles/14292798510993-Authorship

Best regards.

No this is not me, That is Boshra-Hassan is not my profile, and I have not loaded these papers elsewhere

Ah I see. I was under the impression that they are listed in your Google Scholar profile. But anyway, can you indicate (one of) the papers you would like to upload? Title, link etc.?

Best regards.