Hello,

Please add this code to the Theme Settings > Custom CSS > Mobile/Tablet:

.wd-add-img-msg {
    position: relative;
}
.wd-add-img-msg-text {
    position: absolute;
    bottom: 100%;
    left: 50%;
    z-index: 1070;
    visibility: hidden;
    margin-bottom: 8px;
    margin-left: -110px;
    padding: 8px 15px;
    min-width: 220px;
    max-width: 200px;
    height: auto;
    background-color: #000;
    color: #FFF;
    text-align: center;
    text-transform: capitalize;
    white-space: normal;
    letter-spacing: .3px;
    font-weight: 400;
    font-size: 12px;
    line-height: 1.6;
    opacity: 0;
    pointer-events: none;
}
.wd-add-img-msg-text:before {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    width: 0;
    height: 0;
    border-width: 5px 5px 0;
    border-style: solid;
    border-color: transparent;
    border-top-color: #000;
}
.wd-add-img-msg:hover .wd-add-img-msg-text {
    visibility: visible;
    opacity: 1;
    -webkit-animation: wd-fadeInTooltip .3s ease;
    animation: wd-fadeInTooltip .3s ease;
}

We shall fix this in our nearest update.

Best Regards