GUI-programs can be installed using the graphical tool discover. Libraries and command-line (CLI) programs have to be installed manually.
Therefore open a terminal-application (in KDE Plasma it’s called Konsole) and use the tool `dnf` in Fedora. As said by @truffaldino `apt` is the packagemanager of Debian and its derivates (as Ubuntu, etc).
To search a program or something type:
dnf search fuse
I don’t know fedora, and don’t know your cloud-app, but I would try the normal `fuse` package, hoping it will bring the libraries you need.
So doing
dnf install fuse
could do the trick.
So next. Appimages are executable files. But on the filesystem in Linux a file can only be executed if the permission for execution is set on the file. When downloading a file from the internet this permission is not set.
Let’s take a look at permissions… Again in the terminal type:
ls -lh
to see your files and folders.
In front you see something like `drwxrwxrwx`. Some of the letters are just a “-” So `drw-rw—`.
The first letter tells you some additional information. A “d” tells you, it’s a directory. It there ist a “-” it’s a file (or link, etc).
Then there are three groups of potential “rwx”. Those mean “r=read”, “w=write”, “x=eXecute”. And they are thee time there because the permissions can be set for 1. the user the file belongs to, 2. the group the file belongs to, and 3. the rest of the world (all users).
-rw-r--r-- 1 narf narf 217K 1. Sep 18:40 CachyOS.pdf
This is a pdf-file. belonging to user “narf” and group “narf”. The user “narf” may read and write the file. Users in the group “narf” may read the file. All other users may also read the file. Noone, not even “root” can execute the file.
What you need for your appimage is the execution-bit set.
The easiest is with:
chmod u+x FILENAME
`chmod` changes the modes. `u+x` says for the user add the x (execution)-bit.
Then you could run the file just by clicking or double-clicking.
Ah I think with dolphin (the filemanager of KDE Plasma), you can set the executable with a right-click on the file… This might be easier 