The following tips will help you avoid unexpected behaviour when creating, editing, and publishing Articulate Storyline courses.
Work on Your Local Hard Drive
Always save and publish to your local hard drive (typically your C: drive). Working on a network drive or an external (USB) drive can cause erratic behaviour due to latency, such as file corruption, an inability to save changes, and loss of resources.
If you need to place a copy of your project on a network drive or a USB drive for backup or versioning purposes, it's fine to do that after you've closed Storyline. Avoid reopening the project again until you've copied it back to your local hard drive.
Similarly, hosting published output on a network drive isn't supported. Instead, place your content in the location for which it was published. For example, if you published for web, upload your content to a web server; if you published for LMS, upload your content to an LMS, etc.
Use File paths and Naming Conventions That Are Safe for Windows
Be sure the file paths to your projects and published output are well under the 260-character limit imposed by Microsoft Windows. (Publishing adds characters to the file path you selected. If it exceeds 260 characters, your published output will be incomplete.)
Avoid using special characters, accents, or symbols in your file paths and file names. Learn more about naming conventions in this Microsoft article.