Your experience with YEAH.PDF will depend on which platform / browser / app you use.
Depending on which device you're using and which browser or PDF reader you're using, you'll get different results. These are color-coded below:
Works Perfectly -- You'll really enjoy using YEAH.PDF!
No Backward Links -- The links work, but there is no easy way to go back to previous pages on which you clicked links. If you click the Back button, the browser will take you
out of the book completely. There are three ways to deal with this: (1) Note the page number you are on before clicking a link, then return to that page using the page number (2) Refer to the YEAH External Page Number Index and go to the page number where you want to go next (3) Go back to page 1 and click the links from the beginning. You can use YEAH.PDF, but not as easily as if you had Back/Forward buttons or keys.
No Links -- You cannot use any links. You can use page number navigation with the YEAH External Page Number Index to go where you want. The click-based chat section will not work. This is far from ideal, so you may want to consider another option on your platform.
No Backward Links and No Go-to-Page Option -- The links work, but there is no reasonable way to go back through the links you have followed. You can use YEAH.PDF, but you'll probably wish it were easier. You should consider another option on your platform.
Unusable -- You won't be able to use YEAH.PDF at all. You need to use another option on your platform.
Windows / Microsoft Edge -- No Backward Links
Windows / Google Chrome -- No Backward Links
Windows / Firefox Browser -- Works Perfectly Get Firefox for Free
Windows / Adobe PDF Reader -- Works Perfectly Get Free Adobe Acrobat Reader
Windows/ Google Chrome with Adobe PDF Reader Add-In -- Unusable
Windows / Web version of Xodo on Xodo.com -- Unusable
Android / Google Chrome -- No Links
Android / Files App -- No Links
Android / Firefox Browser -- Works Perfectly You can download Firefox for free from the Google Play store
Android / Version of Xodo App -- Works Perfectly You can download the free version of Xodo from the Google Play store
Android / Adobe PDF Reader -- Unusable
iPhone / Safari -- No Backward Links and no Go-to-Page Option
iPhone / FireFox Browser -- Works Perfectly You can download Firefox for free from the Apple Store
iPhone / Free Version of Xodo App -- Works Perfectly You can download the free version of Xodo from the Apple Store
iPhone / Books App -- Unusable
iPhone / Files App -- No Backward Links and no Go-to-Page Option
Other Platforms
We have not tested any other options such as Mac and Linux at this writing. My first recommendation would be to see if a version of Firefox or the free version of the Xodo PDF reader is available on your platform. If you want to try the Linux version of FireFox, you can get it here: Download Mozilla Firefox for Linux — Fast, Private & Free — Firefox. If you want to try the Linux version of Xodo, you can click the "penguin button" on this homepage: Xodo - Secure Document Management & E-Signature Solutions.
If you test YEAH.PDF on a platform other than Windows, Android or iPhone, feel free to email me at ycomputing@aol.com and let me know if it worked or not. I can add it to the list above.