Dear Louise,
Welcome to the forum ! I am sorry to hear about your troubles. I don´t have that camera, I haven´t used the recent versions of the app and I haven´t used the PC Autosave programme, so I am not in a good position really to give you any advice. But before somebody else can be more specific and before you get feeling lonely and abandoned here, I would like to at least point you to the following links in case you missed them, maybe they will help.
Maybe you would be better off using Bluetooth for the app as opposed to WiFi. See here (choose IOS or Android via the two buttons at the top of the page and pls note that point Nr. 4 is about the camera menu, the others are about the app).
Connecting to the Camera (Bluetooth) (fujifilm-dsc.com)
Via WiFi: (the same re. Nr. 4)
Connecting to the Camera (Models That Do Not Support Bluetooth) (fujifilm-dsc.com)
X-T30 Manual Web Version - Wireless Connections
Wireless Connections (Bluetooth<sup>®</sup>, Wireless LAN/Wi-Fi) (fujifilm-dsc.com)
PC Autosave explanation:
3. Saving Photos and Movies to the Computer | Application Software PC AutoSave | FUJIFILM Corporation (fujifilm-dsc.com)
Generally advisable: update firmware on the camera and use the newest version of the app, which you probably do, just saying. In case you decide that you need to upgrade the camera, do it exactly according to the instructions. If you can´t find them, let me know.
For transferring pictures from the camera to the computer, I would say the best thing to do is to use a card reader, that is the fastest and most reliable way of doing it.
Maybe you missed something and the above instructions will help. If not, let us know and surely we will be able to help you further. Nice greetings to Scotland, stay safe !
George