There's no way to combine PDFs as such. What you would need to do is generate your PDF in a different way, i.e. from a List as opposed to the single record. You can utilise the visualforce that you have already, and place it in an <apex:repeat/> block.
Full Answer
How do you combine 2 PDF files together?
How to combine and merge your files into one PDF: Open Acrobat DC to combine files: Open the Tools tab and select "Combine files." Add files: Click "Add Files" and select the files you want to include in your PDF. You can merge PDFs or a mix of PDF documents and other files.
How do I combine two downloaded files?
Method 1: Use an online tool called PDF Joiner. A file explorer window will then open up. Select the files you'd like to merge. You can put together up to 20 at once with PDF Joiner, so just hold down the Ctrl button while clicking on files so that you can select multiple. Click Open.
How do I attach a PDF to Salesforce?
Click Add Files in the Files related list menu, or drag files directly onto the Files related list. (You can drag multiple files, but not a folder. You can't drag files onto read-only related lists.) Note In Lightning Experience, your org may use a custom page layout for the file detail page.
How do I combine PDF files without Acrobat?
How to merge PDF files without Adobe Reader, for freeGo to the Smallpdf Merge Tool.Upload a single document or multiple PDF files into the toolbox (you can drag and drop) > rearrange files or pages positions > Hit 'Merge PDF!' .Voila. Download your merged files.
How do you create a composite PDF?
Open Adobe Acrobat (not Adobe Reader) and do one of the following:Open Adobe Acrobat and from the File menu choose. Create PDF / From Multiple Files.Click the Create PDF button on the toolbar and choose. From Multiple Files.
How do I upload multiple files to Salesforce?
Update from Salesforce In Lightning, you can upload multiple files to a Content Library by going to the Files Tab > Selecting the LIbraries filter > Select the Library you'd like to upload to. The Add Files actions will allow multi-file upload to the Library or folder within the Library which you select.
What is the difference between files and attachments in Salesforce?
Files need to upload, store, find, follow, share, and collaborate on Salesforce files in the cloud. Attach files to records from the Attachments related list on selected detail pages. We can upload a file and store it privately until you're ready to share it. We can share the files with groups, users, etc.
How do I add attachment in Salesforce?
To navigate to 'Attach File' in Salesforce ClassicGo to any task or events records (either via home tab or via open activities/activity history related list of any record).Click Edit.Scroll down to Attachments related lists, then click Attach File.