Plans must be no larger than 60in x 60in (approximately 12,000 pixels vertical dimension plus horizontal dimension).
You must "enable color plans" before creating a Plan Set if you want to view color plans - changing this setting has no effect on existing Plan Sets. By default, this option is turned on, the only time it is turned off is if you're upgrading a very old installation (prior to 2019) or you have disabled that setting yourself. Options and User Preferences are covered in User Guide, see Related Articles.
If you experience difficulties with any particular file, please contact the Architect or author of the file to request they provide you with a file in TIFF format, if possible. If you contact Support, please be prepared to provide our Support department with a copy of the file with which you are having difficult. We cannot guarantee compatibility with every file, even of supported file types (meaning, not every TIF, TIFF, PDF, JPG, etc. will work in ConstructConnect Takeoff, or be displayed with the same quality as its native viewer (Adobe Acrobat, for example, sometimes displays PDFs a little more clearly, with higher definition than Takeoff).