Currently, Classwork.com limits your PDF files to 25 pages. We do that so we're not subject to abuse and "denial of service" attacks that sap our resources. But sometimes, you have a PDF file that's larger than 25 pages and need to create an activity from it. 

Not to worry! You can split your large PDF into multiple files, then upload the activity in chunks. Here's what to do:

Split your PDF into multiple files.

• Visit https://smallpdf.com/split-pdf, a spectacular PDF-editing tool that has a friendly PDF-splitter.
• Upload your document.
• Set the "Split after every ... pages" setting to 25

• Click the blue "Split" button.
• Click the "Download" button

• Save the ZIP file somewhere on your local computer.
• Unzip the ZIP file to retrieve the individual PDF files.

Create a New Activity Using the First PDF File

• In Classwork.com, click "New" then "New Activity."
• Click "UPLOAD a File and Work With It."
• Select "Upload a file from your computer."
• Choose the first PDF file (its name should end in "-1.pdf") from the files you unzipped earlier.
• Select all the pages.
• Click "Submit."
• Classwork.com will create a new activity and drop you into the Studio editor to edit it.

Add the Second PDF

• Open the "Slide" menu and click "Create New Slide(s) from a File."

• Click "Upload a File."
• Select the second PDF from your computer.
• Click "Select All" to select all the pages.
• Set "Where to add the new page(s)?" to "At the end."
• Click the "Add Pages" button.

Repeat With Remaining Files

• Repeat the process you used to add the second file for remaining file. 
• There is no limit to the number of slides you may add to a single activity, though the performance of your browser may slow down, depending on available memory and processor speed. Be sure to test the resulting activity on the same kind of device your students will use to access it.