Linux currently misses an out of the box solution for easy upload.

It should:

• Allow right clicking a file to upload.
• Copy a file in the file explorer or copy text and upload to the correct service with a keyboard shortcut.

A bash script can be made that is called on various triggers. It can be configured inside the desktop environment of choice.

function upload_image
{
    client_id="xxx"
    link=$(curl -s --request POST --url https://api.imgur.com/3/image --header \
        "Authorization: Client-ID ${client_id}" --header "content-type: multipart/form-data;" \
        -F "image=@${1}" | jq -r '.data.link')
    $(echo "$link" | tr -d '\n' | xsel -ib)
    notify-send "Image Uploaded"
}

function upload_text
{
    dtime=`date '+%Y-%m-%d-%H:%M:%S'`
    id=$(curl -s --data "content=${1}&comment=${dtime}&mode_name=JavaScript" \
        https://somepastebinservice.com/save.php | jq -r '.url')
    url="https://somepastebinservice/${id}"
    echo $url | tr -d '\n' | xsel -ib
    notify-send "Text Uploaded"
}

function upload_file
{
    fname=$(basename "$1")
    dtime=`date '+%Y-%m-%d-%H:%M:%S'`
    filename="${dtime}_${fname}"
    /home/yo/scripts/dropbox_uploader.sh upload "$1" "$filename"
    /home/yo/scripts/dropbox_uploader.sh share "$filename" | \
        perl -ne 's/(.*?)(?=https)//; print' | tr -d '\n' | xsel -ib
    notify-send "File Uploaded"
}

function check_file
{
    if [[ $1 == *.jpg ]] || [[ $1 == *.jpeg ]] || [[ $1 == *.png ]] || [[ $1 == *.gif ]]; then
        upload_image "$1"

    elif $(file -bL --mime "$1" | grep -q '^text'); then
        content=$(cat "$1")
        upload_text "$content"

    else
        upload_file "$1"
    fi
}

if [[ $# -gt 0 ]]; then
    for file in "$@"
    do
        check_file "$file"
    done

else
    content=$(xsel -ob)

    if [[ $content == "file://"* ]]; then

        IFS=$'\n'; files=($content); unset IFS

        for (( i=0; i<${#files[@]}; i++ ))
        do
            file=$(echo "${files[$i]#file://}")
            check_file "$file"
        done

    else
        upload_text "$content"
    fi
fi

A script like this handles one or more files. It tries to determine which service should the content be uploaded to.

A right click shortcut can be created in KDE:

[Desktop Entry]
Type=Service
Icon=smiley-shape
X-KDE-ServiceTypes=KonqPopupMenu/Plugin
MimeType=all/allfiles;
Actions=upload;
Encoding=UTF-8

[Desktop Action upload]
Name=Upload File
Icon=smiley-shape
Exec=/home/me/scripts/upload.sh '%f'