Confusing and frustrating, we know, but hang in there.😣 Video editing is resource intensive: an under-powered PC + large files = tedium at the least and failure at most. VP version 7.11, the latest at this writing, is here.
Getting down to basics, what are the PC's specs? What format are the source files, how large (loosely), and at what resolution? How much free space do you have on the cache drive? The path to that drive is listed under OPTIONS|DISK tab|Cache Folder. Considerable free space is required.
To clarify terminology... exporting is when a file is created from the content on the timeline. Often, this would be an mp4 at the suggested defaults, but there are numerous formats and encodings available. Exported files usually go to the DOWNLOADS folder. But you can specify the path under Videopad's OPTIONS|EXPORT tab. Look there for your exports.
Uploading, a separate operation, is when the exported result is sent to a server (the cloud). While VP has the provision to upload directly to various servers, such as DropBox and YouTube, it's not necessary to use that feature. Sometimes it is better to simply go to the server site and use their uploader instead. It will request a file location. Find your exported file and double-click on it.
To share a project so that others can analyze and troubleshoot it, follow these steps...
Load the project onto the timeline. Don't export it.
Click FILE|SAVE AS PORTABLE PROJECT. That will save all the project files + the vpj control file to a folder that can be copied to a USB (for use on another PC) or uploaded. When the SAVE box comes up, specify where you want it saved. Again DOWNLOADS is a good choice. The result will look something like this: 2019-05-09 15-13-50.
Upload that folder to DropBox or the like, share it, and post the shared link here.
You can zip the folder if it contains many files. In Windows 10 right-click the newly saved folder, click SEND TO|COMPRESSED (zipped) FOLDER.
The result yellow folder will have a .zip extension. Upload the zip. If your uploader asks whether it's a file or folder, try the FILE choice.
Exporting is not required. We don't want to see the completed (exported) production, just the project files as you see them on the timeline.
Be aware that SAVE PROJECT updates the vpj control file with the timeline's content - to restore the project at a later date. It's always wise to use SAVE PROJECT AS instead, giving the file a unique # or name, to prevent overwriting of an prior vpj file. This is not the same as saving as a portable project.
Hope this helps sort things out. An UNinstall of VP via Windows Control Panel|Programs and Features, and install of the latest version may be a good first step.