Sometimes, it can be a little challenging to find the master page. Please use this tutorial to find the seattle.html file quickly.
First, let us make sure that you are searching in the correct place. Please open Site Settings:
Then choose Master Pages and Page Layouts. It should be found under the Web Designer Galleries section:
After the page is loaded, there will be lots of files to choose from, so you need to search for the seattle.html file very carefully. Usually, it is located on the 3rd or 4th page. Please use the bottom navigation arrows to switch between pages:
Another useful tool that may help you to find the file is using keyboard shortcuts to launch a search on the page. Please press Ctrl + F (for Windows) or Command + F (for Mac). You will see a search bar appearing on the page. Please type the word seattle into the search bar, and it will immediately highlight the requested information:
Please pay attention that this search option works on each page separately, so, if nothing was found, switch to another page and use the shortcut once again.
As you can see from the above screenshot, we have found the seattle.html file on the last page.
Don't hesitate to contact us with any questions or suggestions! Thanks for your attention.